Organometallic compound, organic light-emitting device including the same, and diagnostic composition including the organometallic compound

ABSTRACT

An organometallic compound represented by Formula 1: 
     
       
         
         
             
             
         
       
         
         
           
             wherein, Formula 1, R 1  to R 10  and A 1  to A 7  are the same as described in the detailed description of the specification.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Korean Patent Applications Nos.10-2018-0089511, filed on Jul. 31, 2018, and 10-2019-0091699, filed onJul. 29, 2019, in the Korean Intellectual Property Office, and all thebenefits accruing therefrom under 35 U.S.C. § 119, the content of whichis incorporated herein in its entirety by reference.

BACKGROUND 1. Field

One or more embodiments relate to an organometallic compound, an organiclight-emitting device including the same, and a diagnostic compositionincluding the organometallic compound.

2. Description of the Related Art

Organic light-emitting devices (OLEDs) are self-emission devices, whichhave superior characteristics in terms of a viewing angle, responsetime, brightness, driving voltage, and response speed, and which producefull-color images.

In an example, an organic light-emitting device includes an anode, acathode, and an organic layer disposed between the anode and thecathode, wherein the organic layer includes an emission layer. A holetransport region may be disposed between the anode and the emissionlayer, and an electron transport region may be disposed between theemission layer and the cathode. Holes provided from the anode may movetoward the emission layer through the hole transport region, andelectrons provided from the cathode may move toward the emission layerthrough the electron transport region. The holes and the electronsrecombine in the emission layer to produce excitons. These excitonstransit from an excited state to a ground state, thereby generatinglight.

Luminescent compounds may be used to monitor, sense, or detect a varietyof biological materials including cells and proteins. An example of suchluminescent compounds is a phosphorescent luminescent compound.

Various types of organic light emitting devices are known. However,there still remains a need in OLEDs having low driving voltage, highefficiency, high brightness, and long lifespan.

SUMMARY

Aspects of the present disclosure provide a novel organometalliccompound, an organic light-emitting device including the same, and adiagnostic composition including the novel organometallic compound.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

An aspect of the present disclosure provides an organometallic compoundrepresented by Formula 1:

In Formula 1,

-   -   R₁ to R₁₀ and A₇ may each independently be hydrogen, deuterium,        —F, —Cl, —Br, —I, —SF₅, a hydroxyl group, a cyano group, a nitro        group, an amino group, an amidino group, a hydrazine group, a        hydrazone group, a carboxylic acid group or a salt thereof, a        sulfonic acid group or a salt thereof, a phosphoric acid group        or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl        group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, a        substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted        or unsubstituted C₁-C₆₀ alkoxy group, a substituted or        unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or        unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or        unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted        C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀        arylthio group, a substituted or unsubstituted C₇-C₆₀ arylalkyl        group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a        substituted or unsubstituted C₁-C₆₀ heteroaryloxy group, a        substituted or unsubstituted C₁-C₆₀ heteroarylthio group, a        substituted or unsubstituted C₂-C₆₀ heteroarylalkyl group, a        substituted or unsubstituted monovalent non-aromatic condensed        polycyclic group, a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂),        —Si(Q₃)(Q₄)(Q₅), —Ge(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), —P(═O)(Q₈)(Q₉), or        —P(Q₈)(Q₉),    -   at least one of R₁ to R₁₀ may each independently be a        substituted or unsubstituted C₂-C₆₀ alkyl group, a substituted        or unsubstituted C₂-C₆₀ alkenyl group, a substituted or        unsubstituted C₂-C₆₀ alkynyl group, a substituted or        unsubstituted C₁-C₆₀ alkoxy group, a substituted or        unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or        unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or        unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted        C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀        arylthio group, a substituted or unsubstituted C₇-C₆₀ arylalkyl        group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a        substituted or unsubstituted C₁-C₆₀ heteroaryloxy group, a        substituted or unsubstituted C₁-C₆₀ heteroarylthio group, a        substituted or unsubstituted C₂-C₆₀ heteroarylalkyl group, a        substituted or unsubstituted monovalent non-aromatic condensed        polycyclic group, a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂),        —Si(Q₃)(Q₄)(Q₅), —Ge(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), —P(═O)(Q₈)(Q₉), or        —P(Q₈)(Q₉),    -   A₁ to A₆ may each independently be a substituted or        unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted        C₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀        alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy        group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₆-C₆₀ aryloxy group, a substituted or        unsubstituted C₆-C₆₀ arylthio group, a substituted or        unsubstituted C₇-C₆₀ arylalkyl group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted C₁-C₆₀ heteroaryloxy group, a substituted or        unsubstituted C₁-C₆₀ heteroarylthio group, a substituted or        unsubstituted C₂-C₆₀ heteroarylalkyl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, or a substituted or unsubstituted monovalent non-aromatic        condensed heteropolycyclic group,    -   two or more of R₁ to R₁₀ may optionally be linked to form a        C₅-C₆₀ carbocyclic group unsubstituted or substituted with at        least one R_(1a) or a C₁-C₆₀ heterocyclic group unsubstituted or        substituted at least one R_(1a),    -   two or more of A₁ to A₆ may optionally be linked to form a        C₅-C₆₀ carbocyclic group unsubstituted or substituted with at        least one R_(1a) or a C₁-C₁₀ heterocyclic group unsubstituted or        substituted with at least one R_(1a),    -   R_(1a) is understood by referring to the detailed description of        R₇,    -   a substituent(s) of the substituted C₁-C₁₀ alkyl group, the        substituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl        group, the substituted C₁-C₁₀ alkoxy group, the substituted        C₃-C₁₀ cycloalkyl group, the substituted C₁-C₁₀ heterocycloalkyl        group, the substituted C₃-C₁₀ cycloalkenyl group, the        substituted C₁-C₁₀ heterocycloalkenyl group, the substituted        C₆-C₆₀ aryl group, the substituted C₆-C₆₀ aryloxy group, the        substituted C₆-C₆₀ arylthio group, the substituted C₇-C₆₀        arylalkyl group, the substituted C₁-C₁₀ heteroaryl group, the        substituted C₁-C₁₀ heteroaryloxy group, the substituted C₁-C₁₀        heteroarylthio group, the substituted C₂-C₆₀ heteroarylalkyl        group, the substituted monovalent non-aromatic condensed        polycyclic group, and the substituted monovalent non-aromatic        condensed heteropolycyclic group may each independently be:    -   deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H,        —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino        group, an amidino group, a hydrazine group, a hydrazone group, a        carboxylic acid group or a salt thereof, a sulfonic acid group        or a salt thereof, a phosphoric acid group or a salt thereof, a        C₁-C₁₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, or a C₁-C₆₀ alkoxy group;    -   a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, or a C₁-C₆₀ alkoxy group, each substituted with        deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H,        —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino        group, an amidino group, a hydrazine group, a hydrazone group, a        carboxylic acid group or a salt thereof, a sulfonic acid group        or a salt thereof, a phosphoric acid group or a salt thereof, a        C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₇-C₆₀ arylalkyl group, a C₁-C₆₀ heteroaryl group, a        C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a        C₂-C₆₀ heteroarylalkyl group, a monovalent non-aromatic        condensed polycyclic group, a monovalent non-aromatic condensed        heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅),        —Ge(Q₁₃)(Q₁₄)(Q₁₅), —B(Q₁₆)(Q₁₇), —P(═O)(Q₁₈)(Q₁₉),        —P(Q₁₈)(Q₁₉), or any combination thereof;    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₇-C₆₀ arylalkyl group, a C₁-C₆₀ heteroaryl group, a        C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a        C₂-C₆₀ heteroarylalkyl group, a monovalent non-aromatic        condensed polycyclic group, or a monovalent non-aromatic        condensed heteropolycyclic group;    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₇-C₆₀ arylalkyl group, a C₁-C₆₀ heteroaryl group, a        C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a        C₂-C₆₀ heteroarylalkyl group, a monovalent non-aromatic        condensed polycyclic group, or a monovalent non-aromatic        condensed heteropolycyclic group, each substituted with        deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H,        —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino        group, an amidino group, a hydrazine group, a hydrazone group, a        carboxylic acid group or a salt thereof, a sulfonic acid group        or a salt thereof, a phosphoric acid group or a salt thereof, a        C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a        C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a        C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀        aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ arylalkyl        group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group,        a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroarylalkyl group, a        monovalent non-aromatic condensed polycyclic group, a monovalent        non-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂),        —Si(Q₂₃)(Q₂₄)(Q₂₅), —Ge(Q₂₃)(Q₂₄)(Q₂₅), —B(Q₂₆)(Q₂₇),        —P(═O)(Q₂₈)(Q₂₉), —P(Q₂₈)(Q₂₉), or any combination thereof;    -   —N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), —Ge(Q₃₃)(Q₃₄)(Q₃₅),        —B(Q₃₆)(Q₃₇), —P(═O)(Q₃₈)(Q₃₉), or —P(Q₃₈)(Q₃₉); or    -   any combination thereof, and    -   Q₁ to Q₉, Q₁₁ to Q₁₉, Q₂₁ to Q₂₉, and Q₃₁ to Q₃₉ may each        independently be hydrogen; deuterium; —F; —Cl; —Br; —I; a        hydroxyl group; a cyano group; a nitro group; an amino group; an        amidino group; a hydrazine group; a hydrazone group; a        carboxylic acid group or a salt thereof; a sulfonic acid group        or a salt thereof; a phosphoric acid group or a salt thereof; a        C₁-C₆₀ alkyl group; a C₂-C₆₀ alkenyl group; a C₂-C₆₀ alkynyl        group; a C₁-C₆₀ alkoxy group; a C₃-C₁₀ cycloalkyl group; a        C₁-C₁₀ heterocycloalkyl group; a C₃-C₁₀ cycloalkenyl group; a        C₁-C₁₀ heterocycloalkenyl group; a C₆-C₆₀ aryl group; a C₆-C₆₀        aryl group substituted with a C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl        group, or any combination thereof; a C₆-C₆₀ aryloxy group; a        C₆-C₆₀ arylthio group; a C₇-C₆₀ arylalkyl group; a C₁-C₆₀        heteroaryl group; a C₁-C₆₀ heteroaryloxy group; a C₁-C₆₀        heteroarylthio group; a C₂-C₆₀ heteroarylalkyl group; a        monovalent non-aromatic condensed polycyclic group, or a        monovalent non-aromatic condensed heteropolycyclic group.

Another aspect of the present disclosure provides an organiclight-emitting device including:

-   -   a first electrode,    -   a second electrode, and    -   an organic layer disposed between the first electrode and the        second electrode,    -   wherein the organic layer includes an emission layer, and    -   wherein the organic layer includes at least one organometallic        compound represented by Formula 1.

Another aspect of the present disclosure provides a diagnosticcomposition including at least one organometallic compound representedby Formula 1.

BRIEF DESCRIPTION OF THE DRAWING

These and/or other aspects will become apparent and more readilyappreciated from the following description of the embodiments, taken inconjunction with the FIGURE which is a schematic view of an organiclight-emitting device according to an embodiment.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments, examples of whichare illustrated in the accompanying drawings, wherein like referencenumerals refer to like elements throughout. In this regard, the presentembodiments may have different forms and should not be construed asbeing limited to the descriptions set forth herein. Accordingly, theembodiments are merely described below, by referring to the FIGURES, toexplain aspects of the present description. As used herein, the term“and/or” includes any and all combinations of one or more of theassociated listed items. Expressions such as “at least one of,” whenpreceding a list of elements, modify the entire list of elements and donot modify the individual elements of the list.

Reference will now be made in detail to embodiments, examples of whichare illustrated in the accompanying drawings, wherein like referencenumerals refer to like elements throughout. In this regard, the presentembodiments may have different forms and should not be construed asbeing limited to the descriptions set forth herein. Accordingly, theembodiments are merely described below, by referring to the FIGURES, toexplain aspects of the present description. As used herein, the term“and/or” includes any and all combinations of one or more of theassociated listed items. Expressions such as “at least one of,” whenpreceding a list of elements, modify the entire list of elements and donot modify the individual elements of the list.

It will be understood that when an element is referred to as being “on”another element, it can be directly in contact with the other element orintervening elements may be present therebetween. In contrast, when anelement is referred to as being “directly on” another element, there areno intervening elements present.

It will be understood that, although the terms first, second, third etc.may be used herein to describe various elements, components, regions,layers, and/or sections, these elements, components, regions, layers,and/or sections should not be limited by these terms. These terms areonly used to distinguish one element, component, region, layer, orsection from another element, component, region, layer, or section.Thus, a first element, component, region, layer, or section discussedbelow could be termed a second element, component, region, layer, orsection without departing from the teachings of the present embodiments.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting. As used herein, thesingular forms “a,” “an,” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise.

The term “or” means “and/or.” It will be further understood that theterms “comprises” and/or “comprising,” or “includes” and/or “including”when used in this specification, specify the presence of statedfeatures, regions, integers, steps, operations, elements, and/orcomponents, but do not preclude the presence or addition of one or moreother features, regions, integers, steps, operations, elements,components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this general inventive conceptbelongs. It will be further understood that terms, such as those definedin commonly used dictionaries, should be interpreted as having a meaningthat is consistent with their meaning in the context of the relevant artand the present disclosure, and will not be interpreted in an idealizedor overly formal sense unless expressly so defined herein.

Exemplary embodiments are described herein with reference to crosssection illustrations that are schematic illustrations of idealizedembodiments. As such, variations from the shapes of the illustrations asa result, for example, of manufacturing techniques and/or tolerances,are to be expected. Thus, embodiments described herein should not beconstrued as limited to the particular shapes of regions as illustratedherein but are to include deviations in shapes that result, for example,from manufacturing. For example, a region illustrated or described asflat may, typically, have rough and/or nonlinear features. Moreover,sharp angles that are illustrated may be rounded. Thus, the regionsillustrated in the figures are schematic in nature and their shapes arenot intended to illustrate the precise shape of a region and are notintended to limit the scope of the present claims.

“About” or “approximately” as used herein is inclusive of the statedvalue and means within an acceptable range of deviation for theparticular value as determined by one of ordinary skill in the art,considering the measurement in question and the error associated withmeasurement of the particular quantity (i.e., the limitations of themeasurement system). For example, “about” can mean within one or morestandard deviations, or within ±30%, 20%, 10%, 5% of the stated value.

An aspect of the present disclosure provides an organometallic compoundrepresented by Formula 1 below:

In Formula 1,

-   -   R₁ to R₁₀ and A₇ may each independently be hydrogen, deuterium,        —F, —Cl, —Br, —I, —SF₅, a hydroxyl group, a cyano group, a nitro        group, an amino group, an amidino group, a hydrazine group, a        hydrazone group, a carboxylic acid group or a salt thereof, a        sulfonic acid group or a salt thereof, a phosphoric acid group        or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl        group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, a        substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted        or unsubstituted C₁-C₆₀ alkoxy group, a substituted or        unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or        unsubstituted heterocycloalkyl group, a substituted or        unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or        unsubstituted heterocycloalkenyl group, a substituted or        unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted        C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀        arylthio group, a substituted or unsubstituted C₇-C₆₀ arylalkyl        group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a        substituted or unsubstituted C₁-C₆₀ heteroaryloxy group, a        substituted or unsubstituted C₁-C₆₀ heteroarylthio group, a        substituted or unsubstituted C₂-C₆₀ heteroarylalkyl group, a        substituted or unsubstituted monovalent non-aromatic condensed        polycyclic group, a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂),        —Si(Q₃)(Q₄)(Q₅), —Ge(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), —P(═O)(Q₈)(C)₉),        or —P(Q₈)(Q₉),    -   at least one of R₁ to R₁₀ (for example, at least one of R₁ to        R₆) may each independently be a substituted or unsubstituted        C₂-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀        alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl        group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a        substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₆-C₆₀ aryloxy group, a substituted or        unsubstituted C₆-C₆₀ arylthio group, a substituted or        unsubstituted C₇-C₆₀ arylalkyl group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted C₁-C₆₀ heteroaryloxy group, a substituted or        unsubstituted C₁-C₆₀ heteroarylthio group, a substituted or        unsubstituted C₂-C₆₀ heteroarylalkyl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, a substituted or unsubstituted monovalent non-aromatic        condensed heteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅),        —Ge(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), —P(═O)(Q₈)(Q₉), or —P(Q₈)(Q₉), and    -   A₁ to A₆ may each independently be a substituted or        unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted        C₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀        alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy        group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₆-C₆₀ aryloxy group, a substituted or        unsubstituted C₆-C₆₀ arylthio group, a substituted or        unsubstituted C₇-C₆₀ arylalkyl group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted C₁-C₆₀ heteroaryloxy group, a substituted or        unsubstituted C₁-C₆₀ heteroarylthio group, a substituted or        unsubstituted C₂-C₆₀ heteroarylalkyl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, or a substituted or unsubstituted monovalent non-aromatic        condensed heteropolycyclic group.    -   Q₁ to Q₉ are the same as described herein.

In an embodiment, Formula 1,

-   -   R₁ to R₁₀ and A₇ may each independently be hydrogen, deuterium,        a cyano group, a substituted or unsubstituted C₁-C₆₀ alkyl        group, or a substituted or unsubstituted C₃-C₁₀ cycloalkyl group        and/or    -   at least one of R₁ to R₁₀ (for example, at least one of R₁ to        R₆) may each independently be a substituted or unsubstituted        C₂-C₆₀ alkyl group, or a substituted or unsubstituted C₃-C₁₀        cycloalkyl group, and/or    -   A₁ to A₆ may each independently be a substituted or        unsubstituted C₁-C₆₀ alkyl group or a substituted or        unsubstituted C₃-C₁₀ cycloalkyl group.

In one or more embodiments, R₁ to R₁₀ and A₇ in Formula 1 may eachindependently be:

-   -   hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amino group, an amidino group, a        hydrazine group, a hydrazone group, a carboxylic acid group or a        salt thereof, a sulfonic acid group or a salt thereof, a        phosphoric acid group or a salt thereof, —SF₅, C₁-C₂₀ alkyl        group, or a C₁-C₂₀ alkoxy group;    -   a C₁-C₂₀ alkyl group or a C₁-C₂₀ alkoxy group, each substituted        with deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃,        —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an        amino group, an amidino group, a hydrazine group, a hydrazone        group, a carboxylic acid group or a salt thereof, a sulfonic        acid group or a salt thereof, a phosphoric acid group or a salt        thereof, a C₁-C₁₀ alkyl group, a C₁-C₂₀ alkoxy group, a        cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cycloctyl group, an adamantanyl group, a norbornanyl group, a        norbornenyl group, a cyclopentenyl group, a cyclohexenyl group,        a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a        bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a        bicyclo[2.2.2]octyl group, a phenyl group, a (C₁-C₂₀        alkyl)phenyl group, a biphenyl group, a terphenyl group, a        naphthyl group, a pyridinyl group, a pyrimidinyl group, or any        combination thereof;    -   a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cycloctyl group, an adamantanyl group, a norbornanyl group, a        norbornenyl group, a cyclopentenyl group, a cyclohexenyl group,        a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a        bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a        bicyclo[2.2.2]octyl group, a phenyl group, a (C₁-C₂₀        alkyl)phenyl group, a biphenyl group, a terphenyl group, a        naphthyl group, a fluorenyl group, a phenanthrenyl group, an        anthracenyl group, a fluoranthenyl group, a triphenylenyl group,        a pyrenyl group, a chrysenyl group, a pyrrolyl group, a        thiophenyl group, a furanyl group, an imidazolyl group, a        pyrazolyl group, a thiazolyl group, an isothiazolyl group, an        oxazolyl group, an isoxazolyl group, a pyridinyl group, a        pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an        isoindolyl group, an indolyl group, an indazolyl group, a        purinyl group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl        group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl        group, a benzimidazolyl group, a benzofuranyl group, a        benzothiophenyl group, an isobenzothiazolyl group, a        benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group,        a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a        dibenzofuranyl group, a dibenzothiophenyl group, a        benzocarbazolyl group, a dibenzocarbazolyl group, an        imidazopyridinyl group, or an imidazopyrimidinyl group, each        unsubstituted or substituted with deuterium, —F, —Cl, —Br, —CD₃,        —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano        group, a nitro group, an amino group, an amidino group, a        hydrazine group, a hydrazone group, a carboxylic acid group or a        salt thereof, a sulfonic acid group or a salt thereof, a        phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a        C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a (C₁-C₂₀ alkyl)phenyl group, a biphenyl group, a        terphenyl group, a naphthyl group, a fluorenyl group, a        phenanthrenyl group, an anthracenyl group, a fluoranthenyl        group, a triphenylenyl group, a pyrenyl group, a chrysenyl        group, a pyrrolyl group, a thiophenyl group, a furanyl group, an        imidazolyl group, a pyrazolyl group, a thiazolyl group, an        isothiazolyl group, an oxazolyl group, an isoxazolyl group, a        pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a        pyridazinyl group, an isoindolyl group, an indolyl group, an        indazolyl group, a purinyl group, a quinolinyl group, an        isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl        group, a quinazolinyl group, a cinnolinyl group, a carbazolyl        group, a phenanthrolinyl group, a benzimidazolyl group, a        benzofuranyl group, a benzothiophenyl group, an        isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a        dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, an imidazopyridinyl group, an        imidazopyrimidinyl group, or any combination thereof;    -   —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), or —P(═O)(Q₉)(Q₉), or    -   any combination thereof.    -   Q₁ to Q₉ are the same as described herein.

In one or more embodiments, R₁ to R₁₀ and A₇ in Formula 1 may eachindependently be:

-   -   hydrogen, deuterium, —F, a cyano group, a methyl group, an ethyl        group, an n-propyl group, an isopropyl group, an n-butyl group,        a sec-butyl group, an isobutyl group, a tert-butyl group, an        n-pentyl group, a tert-pentyl group, a neopentyl group, an        isopentyl group, a sec-pentyl group, a 3-pentyl group, a        sec-isopentyl group, an n-hexyl group, an isohexyl group, a        sec-hexyl group, a tert-hexyl group, an n-heptyl group, an        isoheptyl group, a sec-heptyl group, a tert-heptyl group, an        n-octyl group, an isooctyl group, a sec-octyl group, a        tert-octyl group, an n-nonyl group, an isononyl group, a        sec-nonyl group, a tert-nonyl group, an n-decyl group, an        isodecyl group, a sec-decyl group, a tert-decyl group, a methoxy        group, an ethoxy group, a propoxy group, a butoxy group, a        pentoxy group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a pyridinyl group, a pyrimidinyl group, a carbazolyl        group, a fluorenyl group, a dibenzosilolyl group, a        dibenzofuranyl group, a dibenzothiophenyl group, or        —Si(Q₃)(Q₄)(Q₅);    -   a methyl group, an ethyl group, an n-propyl group, an isopropyl        group, an n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, or a        tert-decyl group, each substituted with deuterium, —F, a cyano        group, or any combination thereof; or    -   a methoxy group, an ethoxy group, a propoxy group, a butoxy        group, a pentoxy group, a cyclopentyl group, a cyclohexyl group,        a cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a pyridinyl group, a pyrimidinyl group, a carbazolyl        group, a fluorenyl group, a dibenzosilolyl group, a        dibenzofuranyl group, or a dibenzothiophenyl group, each        substituted with deuterium, —F, a cyano group, a C₁-C₁₀ alkyl        group, or any combination thereof.    -   Q₃ to Q₅ are the same as described herein.

In one or more embodiments, at least one of R₁ to R₁₀ (for example, atleast one of R₁ to R₆/in an embodiment, R₄) in Formula 1 may eachindependently be:

-   -   a C₂-C₂₀ alkyl group or a C₁-C₂₀ alkoxy group, each        unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I,        —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a        cyano group, a nitro group, an amino group, an amidino group, a        hydrazine group, a hydrazone group, a carboxylic acid group or a        salt thereof, a sulfonic acid group or a salt thereof, a        phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a        C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a (C₁-C₂₀ alkyl)phenyl group, a biphenyl group, a        terphenyl group, a naphthyl group, a pyridinyl group, a        pyrimidinyl group, or any combination thereof;    -   a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cycloctyl group, an adamantanyl group, a norbornanyl group, a        norbornenyl group, a cyclopentenyl group, a cyclohexenyl group,        a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a        bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a        bicyclo[2.2.2]octyl group, a phenyl group, a (C₁-C₂₀        alkyl)phenyl group, a biphenyl group, a terphenyl group, a        naphthyl group, a fluorenyl group, a phenanthrenyl group, an        anthracenyl group, a fluoranthenyl group, a triphenylenyl group,        a pyrenyl group, a chrysenyl group, a pyrrolyl group, a        thiophenyl group, a furanyl group, an imidazolyl group, a        pyrazolyl group, a thiazolyl group, an isothiazolyl group, an        oxazolyl group, an isoxazolyl group, a pyridinyl group, a        pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an        isoindolyl group, an indolyl group, an indazolyl group, a        purinyl group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl        group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl        group, a benzimidazolyl group, a benzofuranyl group, a        benzothiophenyl group, an isobenzothiazolyl group, a        benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group,        a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a        dibenzofuranyl group, a dibenzothiophenyl group, a        benzocarbazolyl group, a dibenzocarbazolyl group, an        imidazopyridinyl group, or an imidazopyrimidinyl group, each        unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I,        —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a        cyano group, a nitro group, an amino group, an amidino group, a        hydrazine group, a hydrazone group, a carboxylic acid group or a        salt thereof, a sulfonic acid group or a salt thereof, a        phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a        C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a (C₁-C₂₀ alkyl)phenyl group, a biphenyl group, a        terphenyl group, a naphthyl group, a fluorenyl group, a        phenanthrenyl group, an anthracenyl group, a fluoranthenyl        group, a triphenylenyl group, a pyrenyl group, a chrysenyl        group, a pyrrolyl group, a thiophenyl group, a furanyl group, an        imidazolyl group, a pyrazolyl group, a thiazolyl group, an        isothiazolyl group, an oxazolyl group, an isoxazolyl group, a        pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a        pyridazinyl group, an isoindolyl group, an indolyl group, an        indazolyl group, a purinyl group, a quinolinyl group, an        isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl        group, a quinazolinyl group, a cinnolinyl group, a carbazolyl        group, a phenanthrolinyl group, a benzimidazolyl group, a        benzofuranyl group, a benzothiophenyl group, an        isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a        dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, an imidazopyridinyl group, an        imidazopyrimidinyl group, or any combination thereof;    -   —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), or —P(═O)(Q₈)(Q₉), or    -   any combination thereof.    -   Q₁ to Q₆ are the same as described herein.

In one or more embodiments, at least one of R₁ to R₁₀ (for example, atleast one of R₁ to R₆/in an embodiment, R₄) Formula 1 may eachindependently be:

-   -   an ethyl group, an n-propyl group, an isopropyl group, an        n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, a        tert-decyl group, a methoxy group, an ethoxy group, a propoxy        group, a butoxy group, a pentoxy group, a cyclopentyl group, a        cyclohexyl group, a cycloheptyl group, a cycloctyl group, an        adamantanyl group, a norbornanyl group, a norbornenyl group, a        cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl        group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl        group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl        group, a phenyl group, a biphenyl group, a terphenyl group, a        naphthyl group, a pyridinyl group, a pyrimidinyl group, a        carbazolyl group, a fluorenyl group, a dibenzosilolyl group, a        dibenzofuranyl group, a dibenzothiophenyl group, or        —Si(Q₃)(Q₄)(Q₅);    -   an ethyl group, an n-propyl group, an isopropyl group, an        n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, or a        tert-decyl group, each substituted with deuterium, —F, a cyano        group, or any combination thereof; or    -   a methoxy group, an ethoxy group, a propoxy group, a butoxy        group, a pentoxy group, a cyclopentyl group, a cyclohexyl group,        a cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a pyridinyl group, a pyrimidinyl group, a carbazolyl        group, a fluorenyl group, a dibenzosilolyl group, a        dibenzofuranyl group, or a dibenzothiophenyl group, each        substituted with deuterium, —F, a cyano group, a C₁-C₁₀ alkyl        group, or any combination thereof.    -   Q₃ to Q₅ are the same as described herein.

In one or more embodiments, A₁ to A₆ in Formula 1 may each independentlybe:

-   -   a C₁-C₂₀ alkyl group or a C₁-C₂₀ alkoxy group, each        unsubstituted or substituted with deuterium, —F, —Cl, —Br, —I,        —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a        cyano group, a nitro group, an amino group, an amidino group, a        hydrazine group, a hydrazone group, a carboxylic acid group or a        salt thereof, a sulfonic acid group or a salt thereof, a        phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a        C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a (C₁-C₂₀ alkyl)phenyl group, a biphenyl group, a        terphenyl group, a naphthyl group, a pyridinyl group, a        pyrimidinyl group, or any combination thereof; or    -   a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cycloctyl group, an adamantanyl group, a norbornanyl group, a        norbornenyl group, a cyclopentenyl group, a cyclohexenyl group,        a cycloheptenyl group, a bicyclo[1.1.1]pentyl group, a        bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, a        bicyclo[2.2.2]octyl group, a phenyl group, a (C₁-C₂₀        alkyl)phenyl group, a biphenyl group, a terphenyl group, a        naphthyl group, a fluorenyl group, a phenanthrenyl group, an        anthracenyl group, a fluoranthenyl group, a triphenylenyl group,        a pyrenyl group, a chrysenyl group, a pyrrolyl group, a        thiophenyl group, a furanyl group, an imidazolyl group, a        pyrazolyl group, a thiazolyl group, an isothiazolyl group, an        oxazolyl group, an isoxazolyl group, a pyridinyl group, a        pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an        isoindolyl group, an indolyl group, an indazolyl group, a        purinyl group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl        group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl        group, a benzimidazolyl group, a benzofuranyl group, a        benzothiophenyl group, an isobenzothiazolyl group, a        benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group,        a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a        dibenzofuranyl group, a dibenzothiophenyl group, a        benzocarbazolyl group, a dibenzocarbazolyl group, an        imidazopyridinyl group, or an imidazopyrimidinyl group, each        unsubstituted or substituted with deuterium, —F, —Cl, —Br, —CD₃,        —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano        group, a nitro group, an amino group, an amidino group, a        hydrazine group, a hydrazone group, a carboxylic acid group or a        salt thereof, a sulfonic acid group or a salt thereof, a        phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a        C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a (C₁-C₂₀ alkyl)phenyl group, a biphenyl group, a        terphenyl group, a naphthyl group, a fluorenyl group, a        phenanthrenyl group, an anthracenyl group, a fluoranthenyl        group, a triphenylenyl group, a pyrenyl group, a chrysenyl        group, a pyrrolyl group, a thiophenyl group, a furanyl group, an        imidazolyl group, a pyrazolyl group, a thiazolyl group, an        isothiazolyl group, an oxazolyl group, an isoxazolyl group, a        pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a        pyridazinyl group, an isoindolyl group, an indolyl group, an        indazolyl group, a purinyl group, a quinolinyl group, an        isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl        group, a quinazolinyl group, a cinnolinyl group, a carbazolyl        group, a phenanthrolinyl group, a benzimidazolyl group, a        benzofuranyl group, a benzothiophenyl group, an        isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a        dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, an imidazopyridinyl group, an        imidazopyrimidinyl group, or any combination thereof.

In one or more embodiments, A₁ to A₆ in Formula 1 may each independentlybe:

-   -   a methyl group, an ethyl group, an n-propyl group, an isopropyl        group, an n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, a        tert-decyl group, a methoxy group, an ethoxy group, a propoxy        group, a butoxy group, a pentoxy group, a cyclopentyl group, a        cyclohexyl group, a cycloheptyl group, a cycloctyl group, an        adamantanyl group, a norbornanyl group, a norbornenyl group, a        cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl        group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl        group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl        group, a phenyl group, a biphenyl group, a terphenyl group, a        naphthyl group, a pyridinyl group, a pyrimidinyl group, a        carbazolyl group, a fluorenyl group, a dibenzosilolyl group, a        dibenzofuranyl group or a dibenzothiophenyl group;    -   a methyl group, an ethyl group, an n-propyl group, an isopropyl        group, an n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, or a        tert-decyl group, each substituted with deuterium, —F, a cyano        group, or any combination thereof; or    -   a methoxy group, an ethoxy group, a propoxy group, a butoxy        group, a pentoxy group, a cyclopentyl group, a cyclohexyl group,        a cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a pyridinyl group, a pyrimidinyl group, a carbazolyl        group, a fluorenyl group, a dibenzosilolyl group, a        dibenzofuranyl group, or a dibenzothiophenyl group, each        substituted with deuterium, —F, a cyano group, a C₁-C₁₀ alkyl        group, or any combination thereof.    -   Q₃ to Q₅ are the same as described herein.

For example, Q₁ to Q₉ may each independently be:

-   -   —CH₃, —CD₃, —CD₂H, —CDH₂, —CH₂CH₃, —CH₂CD₃, —CH₂CD₂H, —CH₂CDH₂,        —CHDCH₃, —CHDCD₂H, —CHDCDH₂, —CHDCD₃, —CD₂CD₃, —CD₂CD₂H, or        —CD₂CDH₂, or    -   an n-propyl group, an isopropyl group, an n-butyl group, a        sec-butyl group, an isobutyl group, a tert-butyl group, an        n-pentyl group, a tert-pentyl group, a neopentyl group, an        isopentyl group, a sec-pentyl group, a 3-pentyl group, a        sec-isopentyl group, a phenyl group, a biphenyl group, or a        naphthyl group, each unsubstituted or substituted with        deuterium, a C₁-C₁₀ alkyl group, a phenyl group, or any        combination thereof,    -   but embodiments of the present disclosure are not limited        thereto.

In one or more embodiments, in Formula 1,

-   -   R₁ to R₁₀ and A₇ may each independently be hydrogen, deuterium,        —F, a cyano group, a nitro group, —SF₅, —CH₃, —CD₃, —CD₂H,        —CDH₂, —CF₃, —CF₂H, —CFH₂, a group represented by one of        Formulae 9-1 to 9-66, a group represented by one of Formulae 9-1        to 9-66 in which at least one hydrogen is substituted with        deuterium, a group represented by one of Formulae 10-1 to        10-249, a group represented by one of Formulae 10-1 to 10-249 in        which at least one hydrogen is substituted with deuterium,        —Si(Q₃)(Q₄)(Q₅), or —Ge(Q₃)(Q₄)(Q₅) (wherein Q₃ to Q₅ are the        same as described herein), and/or    -   at least one of R₁ to R₁₀ (for example, at least one of R₁ to        R₆) may each independently be a group represented by one of        Formulae 9-1 to 9-66, a group represented by one of Formulae 9-1        to 9-66 in which at least one hydrogen is substituted with        deuterium, a group represented by one of Formulae 10-1 to        10-249, a group represented by one of Formulae 10-1 to 10-249 in        which at least one hydrogen is substituted with deuterium,        —Si(Q₃)(Q₄)(Q₅), or —Ge(Q₃)(Q₄)(Q₅) (wherein Q₃ to Q₅ are the        same as described herein), and/or    -   A₁ to A₆ may each independently be —CH₃, —CD₃, —CD₂H, —CDH₂,        —CF₃, —CF₂H, —CFH₂, a group represented by one of Formulae 9-1        to 9-66, a group represented by one of Formulae 9-1 to 9-66 in        which at least one hydrogen is substituted with deuterium, a        group represented by one of Formulae 10-1 to 10-249, or a group        represented by one of Formulae 10-1 to 10-249 in which at least        one hydrogen is substituted with deuterium, but embodiments of        the present disclosure are not limited thereto:

In Formulae 9-1 to 9-66 and 10-1 to 10-249, * indicates a binding siteto a neighboring atom, Ph indicates a phenyl group, and TMS indicates atrimethylsilyl group.

The “group represented by one of Formulae 9-1 to 9-66 in which at leastone hydrogen is substituted with deuterium” may be, for example, a grouprepresented by one of Formulae 9-501 to 9-552:

The “group represented by one of Formulae 10-1 to 10-249 in which atleast one hydrogen is substituted with deuterium” may be, for example, agroup represented by one of Formulae 10-501 to 10-510:

In one or more embodiments, at least one of R₁ to R₁₀ (for example, atleast one of R₁ to R₆) in Formula 1 may be a group represented byFormula 2:

The number of carbon atoms included in Formula 2 may be 4 or more (forexample, 4 to 20, 4 to 15 or 4 to 10).

R₁₃ in Formula 2 may be hydrogen, deuterium, a C₁-C₂₀ alkyl group,deuterium-containing C₁-C₂₀ alkyl group, a C₃-C₁₀ cycloalkyl group, or adeuterium-containing C₃-C₁₀ cycloalkyl group.

R₁₄ and R₁₅ in Formula 2 may each independently be a C₁-C₂₀ alkyl group,deuterium-containing C₁-C₂₀ alkyl group, a C₃-C₁₀ cycloalkyl group, or adeuterium-containing C₃-C₁₀ cycloalkyl group.

* in Formula 2 indicates a binding site to a neighboring atom.

The terms “a deuterium-containing C₁-C₂₀ alkyl group” and “adeuterium-containing C₃-C₁₀ cycloalkyl group” as used herein each referto a C₁-C₂₀ alkyl group substituted with at least one deuterium and aC₃-C₁₀ cycloalkyl group substituted with at least one deuterium,respectively. For example, a deuterium-containing methyl group may be—CDH₂, —CD₂H, and —CD₃.

Non-limiting examples of the “C₁-C₂₀ alkyl group” include a methylgroup, an ethyl group, an n-propyl group, an isopropyl group, an n-butylgroup, a sec-butyl group, an isobutyl group, a tert-butyl group, ann-pentyl group, a tert-pentyl group, a neopentyl group, an isopentylgroup, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, ann-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group,an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptylgroup, an n-octyl group, an isooctyl group, a sec-octyl group, atert-octyl group, an n-nonyl group, an isononyl group, a sec-nonylgroup, a tert-nonyl group, an n-decyl group, an isodecyl group, asec-decyl group, a tert-decyl group, and the like, but embodiments ofthe present disclosure are not limited thereto.

Non-limiting of the “C₃-C₁₀ cycloalkyl group” include a cyclopentylgroup, a cyclohexyl group, a cycloheptyl group, a cycloctyl group, anadamantanyl group, a norbornanyl group, a bicyclo[1.1.1]pentyl group, abicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, abicyclo[2.2.2]octyl group, and the like, but embodiments of the presentdisclosure are not limited thereto.

For example, R₁₃ in Formula 2 may be hydrogen or deuterium.

in an embodiment, R₁₃ in Formula 2 may be a C₁-C₂₀ alkyl group, adeuterium-containing C₁-C₂₀ alkyl group, a C₃-C₁₀ cycloalkyl group, or adeuterium-containing C₃-C₁₀ cycloalkyl group.

In an embodiment, R₁₄ and R₁₅ in Formula 2 may be different from eachother.

In one or more embodiments, in Formula 2,

-   -   R₁₃ may be hydrogen, deuterium, —CH₃, —CDH₂, —CD₂H, or —CD₃, and    -   R₁₄ and R₁₅ may each independently be:    -   a methyl group, an ethyl group, an n-propyl group, an isopropyl        group, an n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, a        tert-decyl group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, a bicyclo[1.1.1]pentyl        group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl        group, or a bicyclo[2.2.2]octyl group; or    -   a methyl group, an ethyl group, an n-propyl group, an isopropyl        group, an n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, a        tert-decyl group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, a bicyclo[1.1.1]pentyl        group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl        group, or a bicyclo[2.2.2]octyl group, each substituted with at        least one deuterium,    -   but embodiments of the present disclosure are not limited        thereto.

In one or more embodiments, in Formula 2,

-   -   R₁₃ may be hydrogen, deuterium, —CH₃, —CDH₂, —CD₂H, or —CD₃,    -   R₁₄ may be —CH₃, —CDH₂, —CD₂H, or —CD₃, and    -   R₁₅ may be:    -   an ethyl group, an n-propyl group, an isopropyl group, an        n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, a        tert-decyl group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, a bicyclo[1.1.1]pentyl        group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl        group, or a bicyclo[2.2.2]octyl group; or    -   an ethyl group, an n-propyl group, an isopropyl group, an        n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, a        tert-decyl group, a cyclopentyl group, a cyclohexyl group, a        cycloheptyl group, a cycloctyl group, a bicyclo[1.1.1]pentyl        group, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl        group, or a bicyclo[2.2.2]octyl group, each substituted with at        least one deuterium,    -   but embodiments of the present disclosure are not limited        thereto.

In one or more embodiments, R₁₄ and R₁₅ in Formula 2 may eachindependently be —CH₃, —CDH₂, —CD₂H, —CD₃, a group represented by one ofFormulae 9-1 to 9-33, a group represented by one of Formulae 9-1 to 9-33in which at least one hydrogen is substituted with deuterium, a grouprepresented by one of Formulae 10-1 to 10-10, or a group represented byone of Formulae 10-1 to 10-10 in which at least one hydrogen issubstituted with deuterium, but embodiments of the present disclosureare not limited thereto.

In one or more embodiments, a case where R₁₃ to R₁₅ in Formula 2 are allthe same may be excluded.

In one or more embodiments, a case where R₁₃ to R₁₅ in Formula 2 are allmethyl groups may be excluded.

In an embodiment, at least one of R₁ to R₆ in Formula 1 may eachindependently be a group represented by Formula 2.

For example, R₄ in Formula 1 may be a group represented by Formula 2.

In an embodiment, R₁ to R₃, R₅, and R₆ in Formula 1 may each behydrogen, and R₄ may be a group represented by Formula 2.

In an embodiment, at least one of R₄, R₇, and R₉ in Formula 1 may not beeach hydrogen.

In one or more embodiments, each of R₇ and R₉ in Formula 1 may not behydrogen.

In one or more embodiments, in Formula 1, each of R₇ and R₉ may not behydrogen, and each of R₈ and R₁₀ may not be hydrogen.

In one or more embodiments, none of R₄, R₇, and R₉ in Formula 1 may behydrogen.

In one or more embodiments, each of R₇ and R₉ in Formula 1 may not behydrogen, and R₇ and R₉ may be identical to each other.

In one or more embodiments, each of R₇ and R₉ in Formula 1 may not behydrogen, and R₇ and R₉ may be different from each other.

In one or more embodiments, in Formula 1, each of R₇ and R₉ may not behydrogen, R₇ and R₉ may be different from each other, and the number ofcarbon atoms included in R₇ may be greater than that of carbon atomsincluded in R₉.

In one or more embodiments, R₇ and R₉ in Formula 1 may eachindependently be a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkyl group, or a substitutedor unsubstituted C₆-C₆₀ aryl group.

In one or more embodiments, at least one of R₇ and R₉ in Formula 1 mayeach independently be a substituted or unsubstituted C₂-C₆₀ alkyl group,a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, or a substitutedor unsubstituted C₆-C₆₀ aryl group.

In one or more embodiments, at least one of A₁ to A₆ in Formula 1 mayeach independently be a substituted or unsubstituted C₂-C₆₀ alkyl group,a substituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkylgroup, a substituted or unsubstituted heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted heterocycloalkenyl group, a substituted or unsubstitutedC₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group,a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₇-C₆₀ arylalkyl group, a substituted or unsubstitutedC₁-C₆₀ heteroaryl group, a substituted or unsubstituted C₁-C₆₀heteroaryloxy group, a substituted or unsubstituted C₁-C₆₀heteroarylthio group, a substituted or unsubstituted C₂-C₆₀heteroarylalkyl group, a substituted or unsubstituted monovalentnon-aromatic condensed polycyclic group, or a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group.

For example, at least one of A₁ to A₆ in Formula 1 may eachindependently be:

-   -   an ethyl group, an n-propyl group, an isopropyl group, an        n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, a        tert-decyl group, a methoxy group, an ethoxy group, a propoxy        group, a butoxy group, a pentoxy group, a cyclopentyl group, a        cyclohexyl group, a cycloheptyl group, a cycloctyl group, an        adamantanyl group, a norbornanyl group, a norbornenyl group, a        cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl        group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl        group, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl        group, a phenyl group, a biphenyl group, a terphenyl group, a        naphthyl group, a pyridinyl group, a pyrimidinyl group, a        carbazolyl group, a fluorenyl group, a dibenzosilolyl group, a        dibenzofuranyl group, or a dibenzothiophenyl group;    -   an ethyl group, an n-propyl group, an isopropyl group, an        n-butyl group, a sec-butyl group, an isobutyl group, a        tert-butyl group, an n-pentyl group, a tert-pentyl group, a        neopentyl group, an isopentyl group, a sec-pentyl group, a        3-pentyl group, a sec-isopentyl group, an n-hexyl group, an        isohexyl group, a sec-hexyl group, a tert-hexyl group, an        n-heptyl group, an isoheptyl group, a sec-heptyl group, a        tert-heptyl group, an n-octyl group, an isooctyl group, a        sec-octyl group, a tert-octyl group, an n-nonyl group, an        isononyl group, a sec-nonyl group, a tert-nonyl group, an        n-decyl group, an isodecyl group, a sec-decyl group, or a        tert-decyl group, each substituted with deuterium, —F, a cyano        group, any combination thereof; or    -   a methoxy group, an ethoxy group, a propoxy group, a butoxy        group, a pentoxy group, a cyclopentyl group, a cyclohexyl group,        a cycloheptyl group, a cycloctyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a cyclopentenyl group, a        cyclohexenyl group, a cycloheptenyl group, a        bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, a        bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a pyridinyl group, a pyrimidinyl group, a carbazolyl        group, a fluorenyl group, a dibenzosilolyl group, a        dibenzofuranyl group, or a dibenzothiophenyl group, each        substituted with deuterium, —F, a cyano group, a C₁-C₁₀ alkyl        group, any combination thereof.    -   Q₃ to Q₅ are the same as described herein.

In an embodiment, at least one of A₁ to A₆ in Formula 1 may eachindependently be a group represented by one of Formulae 9-1 to 9-66, agroup represented by one of Formulae 9-1 to 9-66 in which at least onehydrogen is substituted with deuterium, a group represented by one ofFormulae 10-1 to 10-249, or a group represented by one of Formulae 10-1to 10-249 in which at least one hydrogen is substituted with deuterium,but embodiments of the present disclosure are not limited thereto.

In one or more embodiments, A₇ may not be hydrogen.

In one or more embodiments, in Formula 1, a group represented by*—C(A₁)(A₂)(A₃) and a group represented by *—C(A₄)(A₅)(A₆) may beidentical to each other, and * indicates a binding site to a neighboringatom.

In one or more embodiments, in Formula 1 a group represented by*—C(A₁)(A₂)(A₃) and a group represented by *—C(A₄)(A₅)(A₆) may bedifferent from each other, and * indicates a binding site to aneighboring atom.

In one or more embodiments, in Formula 1,

-   -   A₁ an A₂ may be identical to each other, and A₁ and A₃ may be        different from each other; and/or    -   A₄ and A₅ may be identical to each other, and A₄ and A₆ may be        different from each other.

In Formula 1, two or more of R₁ to R₁₀ may optionally be linked to forma C₅-C₆₀ carbocyclic group unsubstituted or substituted with at leastone R_(1a) or a C₁-C₆₀ heterocyclic group unsubstituted or substitutedwith at least one R_(1a), and two or more of A₁ to A₆ may optionally belinked to form a C₅-C₆₀ carbocyclic group unsubstituted or substitutedwith at least one R_(1a) or a C₁-C₆₀ heterocyclic group unsubstituted orsubstituted with at least one R_(1a). Here, R_(1a) is the same asdefined in connection with R₇.

For example, a C₅-C₆₀ carbocyclic group unsubstituted or substitutedwith at least one R_(1a) and a C₁-C₆₀ heterocyclic group unsubstitutedor substituted with at least one R_(1a) may each independently be acyclopentane group, a cyclohexane group, a cycloheptane group, acyclooctane group, an adamantane group, a norbornane group, a norbornenegroup, a cyclopentene group, a cyclohexene group, a cycloheptene group,a bicyclo[1.1.1]pentane group, a bicyclo[2.1.1]hexane group, abicyclo[2.2.1]heptane group, a bicyclo[2.2.2]octane group, a benzenegroup, a naphthalene group, a fluorene group, a phenanthrene group, ananthracene group, a fluoranthene group, a triphenylene group, a pyrenegroup, a chrysene group, a pyrrole group, a thiophene group, a furangroup, an imidazole group, a pyrazole group, a thiazole group, anisothiazole group, an oxazole group, an isoxazole group, a pyridinegroup, a pyrazine group, a pyrimidine group, a pyridazine group, anisoindole group, an indole group, an indazole group, a purine group, aquinoline group, an isoquinoline group, a benzoquinoline group, aquinoxaline group, a quinazoline group, a cinnoline group, a carbazolegroup, a phenanthroline group, a benzimidazole group, a benzofurangroup, a benzothiophene group, an isobenzothiophene group, a benzoxazolegroup, an isobenzoxazole group, a triazole group, a tetrazole group, anoxadiazole group, a triazine group, a tetrazine group, a dibenzofurangroup, a dibenzothiophene group, a benzocarbazole group, adibenzocarbazole group, an imidazopyridine group, or animidazopyrimidine group, each unsubstituted or substituted with at leastone R_(1a), but embodiments of the present disclosure are not limitedthereto.

In an embodiment, two or more of A₁ to A₃ (for example, all of A₁ to A₃)in Formula 1 may be linked to form a C₅-C₆₀ carbocyclic groupunsubstituted or substituted with at least one R_(1a) or a C₁-C₆₀heterocyclic group unsubstituted or substituted with at least oneR_(1a), and/or two or more of A₄ to A₆ (for example, all of A₄ to A₆) inFormula 1 may be linked to form a C₅-C₆₀ carbocyclic group unsubstitutedor substituted with at least one R_(1a) or a C₁-C₆₀ heterocyclic groupunsubstituted or substituted with at least one R_(1a).

In one or more embodiments, in Formula 1, at least one of a grouprepresented by *—C(A₁)(A₂)(A₃) and a group represented by *-(A₄)(A₅)(A₆)may each independently be a cyclopentane group, a cyclohexane group, acycloheptane group, a cyclooctane group, an adamantane group, anorbornane group, a norbornene group, a cyclopentene group, acyclohexene group, a cycloheptene group, a bicyclo[1.1.1]pentane group,a bicyclo[2.1.1]hexane group, a bicyclo[2.2.1]heptane group, abicyclo[2.2.2]octane group, a benzene group, a naphthalene group, afluorene group, a phenanthrene group, an anthracene group, afluoranthene group, a triphenylene group, a pyrene group, a chrysenegroup, a pyrrole group, a thiophene group, a furan group, an imidazolegroup, a pyrazole group, a thiazole group, an isothiazole group, anoxazole group, an isoxazole group, a pyridine group, a pyrazine group, apyrimidine group, a pyridazine group, an isoindole group, an indolegroup, an indazole group, a purine group, a quinoline group, anisoquinoline group, a benzoquinoline group, a quinoxaline group, aquinazoline group, a cinnoline group, a carbazole group, aphenanthroline group, a benzimidazole group, a benzofuran group, abenzothiophene group, an isobenzothiophene group, a benzoxazole group,an isobenzoxazole group, a triazole group, a tetrazole group, anoxadiazole group, a triazine group, a tetrazine group, a dibenzofurangroup, a dibenzothiophene group, a benzocarbazole group, adibenzocarbazole group, an imidazopyridine group, or animidazopyrimidine group, each unsubstituted or substituted with at leastone R_(1a), but embodiments of the present disclosure are not limitedthereto.

For example, the organometallic compound represented by Formula 1 may beone of Compounds 1 to 6, but embodiments of the present disclosure arenot limited thereto:

At least one of R₁ to R₁₀ in Formula 1 may each independently be asubstituted or unsubstituted C₂-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₇-C₆₀ arylalkyl group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedheteroaryloxy group, a substituted or unsubstituted C₁-C₆₀heteroarylthio group, a substituted or unsubstituted C₂-C₆₀heteroarylalkyl group, a substituted or unsubstituted monovalentnon-aromatic condensed polycyclic group, a substituted or unsubstitutedmonovalent non-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂),—Si(Q₃)(Q₄)(Q₅), —Ge(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), —P(═O)(Q₈)(Q₉), or—P(Q₈)(Q₉). For example, at least one of R₁ to R₁₀ (for example, atleast one of R₁ to R₆) in Formula 1 may not be hydrogen nor a methylgroup, but may be a substituent described above. In this regard, theorganometallic compound represented by Formula 1 may have an increasedelectron-donating effect so that a wavelength of the light emitted bythe organometallic compound may be shifted to a relatively shortwavelength side. Accordingly, the non-radiative transition of theorganometallic compound may decrease while the photoluminescence quantumyield (PLQY) of the organometallic compound may increase. As a result,an electronic device, for example, an organic light-emitting device,including the organometallic compound may have increased externalquantum efficiency (EQE), and the full width at half maximum (FWHM) ofthe electroluminescence (EL) spectrum peak of such an organiclight-emitting device may be reduced.

In one or more embodiments, A₁ to A₆ in Formula 1 may each independentlybe a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted heterocycloalkyl group, a substituted orunsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstitutedheterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₆-C₆₀ aryloxy group, asubstituted or unsubstituted C₆-C₆₀ arylthio group, a substituted orunsubstituted C₇-C₆₀ arylalkyl group, a substituted or unsubstitutedC₁-C₆₀ heteroaryl group, a substituted or unsubstituted C₁-C₆₀heteroaryloxy group, a substituted or unsubstituted C₁-C₆₀heteroarylthio group, a substituted or unsubstituted C₂-C₆₀heteroarylalkyl group, a substituted or unsubstituted monovalentnon-aromatic condensed polycyclic group, or a substituted orunsubstituted monovalent non-aromatic condensed heteropolycyclic group.For example, each of A₁ to A₆ Formula 1 may not be hydrogen, but mayinclude at least one carbon.

Although not limited to a particular theory, an α-proton has chemicalreactivity that is about 10⁵ greater than that of a β-proton. That is,the α-proton may cause a side reaction due to production ofintermediates in various forms during synthesis and/or storage of acompound. However, each A₁ to A₆ in Formula 1 as described above may notinclude the α-proton, and in this regard, the organometallic compoundrepresented by Formula 1 may have a stable chemical structure withminimal occurrence of a side reaction before/after synthesis, and at thesame time, an intermolecular interaction of the organometallic compoundmay be minimized during the operation of an electronic device (forexample, an organic light-emitting device) including the organometalliccompound. Thus, an electronic device, for example, an organiclight-emitting device, including the organometallic compound representedby Formula 1 may have improved luminescence efficiency and lifespancharacteristics.

A highest occupied molecular orbital (HOMO) energy level, a lowestunoccupied molecular orbital (LUMO) energy level, a singlet (S₁) energylevel, and a triplet (T₁) energy level of some compounds of theorganometallic compound represented by Formula 1 are evaluated by adensity functional theory (DFT) of Gaussian program with molecularstructure optimization based on B3LYP, and results are shown in Table 1.

TABLE 1 Compound HOMO LUMO T₁ No. (eV) (eV) (eV) 1 −4.554 −1.672 1.974 2−4.542 −1.659 2.008 3 −4.543 −1.660 1.975 4 −4.504 −1.644 1.978 5 −4.543−1.658 1.977 6 −4.567 −1.672 1.990

Referring to Table 1, it is confirmed that the organometallic compoundrepresented by Formula 1 has such electrical characteristics that aresuitable for use as a dopant for in an electronic device, for example,for an organic light-emitting device.

Synthesis methods of the organometallic compound represented by Formula1 may be recognizable by one of ordinary skill in the art by referringto Synthesis Examples provided below.

Therefore, the organometallic compound represented by Formula 1 may besuitable for use as a dopant in an organic layer of an organiclight-emitting device, for example, in an emission layer of the organiclayer. Another aspect of the present disclosure provides an organiclight-emitting device including: a first electrode, a second electrode,and an organic layer disposed between the first electrode and the secondelectrode and including an emission layer, wherein the organic layerincludes at least one organometallic compound represented by Formula 1.

The organic light-emitting device may have, due to the inclusion of anorganic layer including the organometallic compound represented byFormula 1, an improved driving voltage, an improved external quantumefficiency, an improved low roll-off ratio, and an improved longlifespan.

The organometallic compound represented by Formula 1 may be used betweena pair of electrodes of an organic light-emitting device. For example,the organometallic compound represented by Formula 1 may be included inthe emission layer. In this regard, the organometallic compound may actas a dopant, and the emission layer may further include a host (that is,an amount of the organometallic compound represented by Formula 1 issmaller than an amount of the host). The emission layer may emit redlight having a maximum emission wavelength in a range of, for example,about 550 nanometers (nm) or more (for example, about 550 nm or more andabout 900 nm or less).

The expression “(an organic layer) includes at least one organometalliccompound” as used herein may include an embodiment in which “(an organiclayer) includes identical organometallic compounds represented byFormula 1” and an embodiment in which “(an organic layer) includes twoor more different organometallic compounds represented by Formula 1”.

For example, the organic layer may include, as the organometalliccompound, only Compound 1. In this regard, Compound 1 may be includedonly in the emission layer of the organic light-emitting device. In oneor more embodiments, the organic layer may include, as theorganometallic compound, Compound 1 and Compound 2. In this regard,Compound 1 and Compound 2 may be included in an identical layer (forexample, Compound 1 and Compound 2 all may exist in an emission layer).

The first electrode may be an anode, which is a hole injectionelectrode, and the second electrode may be a cathode, which is anelectron injection electrode; or the first electrode may be a cathode,which is an electron injection electrode, and the second electrode maybe an anode, which is a hole injection electrode.

For example, the organic light-emitting device, the first electrode isan anode, and the second electrode is a cathode, and the organic layerfurther includes a hole transport region between the first electrode andthe emission layer and an electron transport region between the emissionlayer and the second electrode, and the hole transport region includes ahole injection layer, a hole transport layer, an electron blockinglayer, or any combination thereof, and the electron transport regionincludes a hole blocking layer, an electron transport layer, an electroninjection layer, or any combination thereof.

The term “organic layer” as used herein refers to a single layer and/ora plurality of layers disposed between the first electrode and thesecond electrode of an organic light-emitting device. The “organiclayer” may include, in addition to an organic compound, anorganometallic complex including metal.

The FIGURE is a schematic cross-sectional view of an organiclight-emitting device 10 according to an embodiment. Hereinafter, thestructure of an organic light-emitting device according to an embodimentand a method of manufacturing an organic light-emitting device accordingto an embodiment will be described in connection with the FIGURE. Theorganic light-emitting device 10 includes a first electrode 11, anorganic layer 15, and a second electrode 19, which are sequentiallystacked.

A substrate may be additionally disposed under the first electrode 11 orabove the second electrode 19. For use as the substrate, any substratethat is used in general organic light-emitting devices may be used, andthe substrate may be a glass substrate or a transparent plasticsubstrate, each having excellent mechanical strength, thermal stability,transparency, surface smoothness, ease of handling, and waterresistance.

The first electrode 11 may be formed by depositing or sputtering amaterial for forming the first electrode 11 on the substrate. The firstelectrode 11 may be an anode. The material for forming the firstelectrode 11 may be a material with a high work function to facilitatehole injection. The first electrode 11 may be a reflective electrode, asemi-reflective electrode, or a transmissive electrode. The material forforming the first electrode may be, for example, indium tin oxide (ITO),indium zinc oxide (IZO), tin oxide (SnO₂), and zinc oxide (ZnO). In oneor more embodiments, the material for forming the first electrode 11 maybe metal, such as magnesium (Mg), aluminum (Al), aluminum-lithium(Al—Li), calcium (Ca), magnesium-indium (Mg—In), or magnesium-silver(Mg—Ag).

The first electrode 11 may have a single-layered structure or amulti-layered structure including two or more layers. For example, thefirst electrode 11 may have a three-layered structure of ITO/Ag/ITO, butthe structure of the first electrode 11 is not limited thereto.

The organic layer 15 is disposed on the first electrode 11.

The organic layer 15 may include a hole transport region, an emissionlayer, and an electron transport region.

The hole transport region may be disposed between the first electrode 11and the emission layer.

The hole transport region may include a hole injection layer, a holetransport layer, an electron blocking layer, a buffer layer, or anycombination thereof.

The hole transport region may include only either a hole injection layeror a hole transport layer. In one or more embodiments, the holetransport region may have a hole injection layer/hole transport layerstructure or a hole injection layer/hole transport layer/electronblocking layer structure, which are sequentially stacked in this statedorder from the first electrode 11.

When the hole transport region includes a hole injection layer, the holeinjection layer may be formed on the first electrode 11 by using one ormore suitable methods, for example, vacuum deposition, spin coating,casting, and/or Langmuir-Blodgett (LB) deposition.

When a hole injection layer is formed by vacuum deposition, thedeposition conditions may vary according to a material that is used toform the hole injection layer, and the structure and thermalcharacteristics of the hole injection layer. For example, the depositionconditions may include a deposition temperature of about 100° C. toabout 500° C., a vacuum pressure of about 10⁻⁸ to about 10⁻³ torr, and adeposition rate of about 0 Angstroms per second (Å/sec) to about 100Å/sec. However, the deposition conditions are not limited thereto, butembodiments of the present disclosure are not limited thereto.

When the hole injection layer is formed using spin coating, coatingconditions may vary according to the material used to form the holeinjection layer, and the structure and thermal properties of the holeinjection layer. For example, a coating speed may be from about 2,000revolutions per minute (rpm) to about 5,000 rpm, and a temperature atwhich a heat treatment is performed to remove a solvent after coatingmay be from about 80° C. to about 200° C. However, the coatingconditions are not limited thereto.

Conditions for forming a hole transport layer and an electron blockinglayer may be understood by referring to conditions for forming the holeinjection layer.

The hole transport region may include m-MTDATA, TDATA, 2-TNATA, NPB,β-NPB, TPD, spiro-TPD, spiro-NPB, methylated-NPB, TAPC, HMTPD,4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA),polyaniline/dodecylbenzene sulfonic acid (PANI/DBSA),poly(3,4-ethylenedioxythiophene)/poly(4-styrene sulfonate) (PEDOT/PSS),polyaniline/camphor sulfonic acid (PANI/CSA), polyaniline/poly(4-styrenesulfonate) (PANI/PSS), a compound represented by Formula 201 below, acompound represented by Formula 202 below, or any combination thereof:

Ar₁₀₁ to Ar₁₀₂ in Formula 201 may each independently be a phenylenegroup, a pentalenylene group, an indenylene group, a naphthylene group,an azulenylene group, a heptalenylene group, an acenaphthylene group, afluorenylene group, a phenalenylene group, a phenanthrenylene group, ananthracenylene group, a fluoranthenylene group, a triphenylenylenegroup, a pyrenylene group, a chrysenylenylene group, a naphthacenylenegroup, a picenylene group, a perylenylene group, or a pentacenylenegroup, each unsubstituted or substituted with deuterium, —F, —Cl, —Br,—I, a hydroxyl group, a cyano group, a nitro group, an amino group, anamidino group, a hydrazine group, a hydrazone group, a carboxylic acidgroup or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ arylalkyl group, aC₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀heteroarylthio group, a C₂-C₆₀ heteroarylalkyl group, a monovalentnon-aromatic condensed polycyclic group, a monovalent non-aromaticcondensed heteropolycyclic group, or any combination thereof.

xa and xb in Formula 201 may each independently be an integer from 0 to5, or may be 0, 1 or 2. For example, xa may be 1 and xb may be 0, but xaand xb are not limited thereto.

-   -   R₁₀₁ to R₁₀₈, R₁₁₁ to R₁₁₉, and R₁₂₁ to R₁₂₄ in Formulae 201 and        202 may each independently be:    -   hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amino group, an amidino group, a        hydrazine group, a hydrazone group, a carboxylic acid group or a        salt thereof, a sulfonic acid group or a salt thereof, a        phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group        (for example, a methyl group, an ethyl group, a propyl group, a        butyl group, pentyl group, a hexyl group, and the like), or a        C₁-C₁₀ alkoxy group (for example, a methoxy group, an ethoxy        group, a propoxy group, a butoxy group, a pentoxy group, and the        like);    -   a C₁-C₁₀ alkyl group or a C₁-C₁₀ alkoxy group, each substituted        with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amino group, an amidino group, a        hydrazine group, a hydrazone group, a carboxylic acid group or a        salt thereof, a sulfonic acid group or a salt thereof, a        phosphoric acid group or a salt thereof, or any combination        thereof; or    -   a phenyl group, a naphthyl group, an anthracenyl group, a        fluorenyl group, or a pyrenyl group, each unsubstituted or        substituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amino group, an amidino group,        a hydrazine group, a hydrazone group, a carboxylic acid group or        a salt thereof, a sulfonic acid group or a salt thereof, a        phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a        C₁-C₁₀ alkoxy group, or any combination thereof,    -   but embodiments of the present disclosure are not limited        thereto.

R₁₀₉ in Formula 201 may be a phenyl group, a naphthyl group, ananthracenyl group, or a pyridinyl group, each unsubstituted orsubstituted with deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, anaphthyl group, an anthracenyl group, a pyridinyl group, or anycombination thereof.

In an embodiment, the compound represented by Formula 201 may berepresented by Formula 201A, but embodiments of the present disclosureare not limited thereto:

Detailed descriptions of R₁₀₁, R₁₁₁, R₁₁₂, and R₁₀₉ in Formula 201A arethe same as described provided herein.

For example, the compound represented by Formula 201 and the compoundrepresented by Formula 202 may each include one of Compounds HT1 to HT20or any combination thereof, but embodiments of the present disclosureare not limited thereto:

A thickness of the hole transport region may be from about 100 Å toabout 10,000 Å, for example, about 100 Å to about 1,000 Å. When the holetransport region includes at least one of a hole injection layer and ahole transport layer, a thickness of the hole injection layer may be ina range of about 100 Å to about 10,000 Å, for example, about 100 Å toabout 1,000 Å, and a thickness of the hole transport layer may be in arange of about 50 Å to about 2,000 Å, for example about 100 Å to about1,500 Å. While not wishing to be bound by theory, it is understood thatwhen the thicknesses of the hole transport region, the hole injectionlayer, and the hole transport layer are within these ranges,satisfactory hole transporting characteristics may be obtained without asubstantial increase in driving voltage.

The hole transport region may further include, in addition to thesematerials, a charge-generation material for the improvement ofconductive properties. The charge-generation material may behomogeneously or non-homogeneously dispersed in the hole transportregion.

The charge-generation material may be, for example, a p-dopant. Thep-dopant may be a quinone derivative, a metal oxide, a cyanogroup-containing compound, or any combination thereof, but embodimentsof the present disclosure are not limited thereto. Non-limiting examplesof the p-dopant are a quinone derivative, such astetracyanoquinonedimethane (TCNQ) or2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ); ametal oxide, such as a tungsten oxide or a molybdenum oxide; and a cyanogroup-containing compound, such as Compound HT-D1 below, but are notlimited thereto:

The hole transport region may include a buffer layer.

Also, the buffer layer may compensate for an optical resonance distanceaccording to a wavelength of light emitted from the emission layer, andthus, efficiency of a formed organic light-emitting device may beimproved.

Meanwhile, when the hole transport region includes an electron blockinglayer, a material for the electron blocking layer may be materials forthe hole transport region described above, materials for a host to beexplained later, or any combination thereof. However, the material forthe electron blocking layer is not limited thereto. For example, whenthe hole transport region includes an electron blocking layer, amaterial for the electron blocking layer may be mCP, which will beexplained later.

Then, an emission layer may be formed on the hole transport region byvacuum deposition, spin coating, casting, LB deposition, or the like.When the emission layer is formed by vacuum deposition or spin coating,the deposition or coating conditions may be similar to those applied informing the hole injection layer although the deposition or coatingconditions may vary according to a compound that is used to form theemission layer.

The emission layer may include a host and a dopant, and the dopant mayinclude the organometallic compound represented by Formula 1.

The host may include TPBi, TBADN, ADN (also referred to as “DNA”), CBP,CDBP, TCP, mCP, Compounds H50, Compound H51, Compound H52, or anycombination thereof:

When the organic light-emitting device is a full-color organiclight-emitting device, the emission layer may be patterned into a redemission layer, a green emission layer, and/or a blue emission layer. Inone or more embodiments, due to a stacked structure including a redemission layer, a green emission layer, and/or a blue emission layer,the emission layer may emit white light.

When the emission layer includes a host and a dopant, an amount of thedopant may be in a range of about 0.01 parts by weight to about 15 partsby weight based on 100 parts by weight of the host, but embodiments ofthe present disclosure are not limited thereto.

A thickness of the emission layer may be in a range of about 100 Å toabout 1,000 Å, for example, about 200 Å to about 600 Å. While notwishing to be bound by theory, it is understood that when the thicknessof the emission layer is within this range, excellent light-emissioncharacteristics may be obtained without a substantial increase indriving voltage.

Then, an electron transport region may be disposed on the emissionlayer.

The electron transport region may include a hole blocking layer, anelectron transport layer, an electron injection layer, or anycombination thereof.

For example, the electron transport region may have a hole blockinglayer/electron transport layer/electron injection layer structure or anelectron transport layer/electron injection layer structure, but thestructure of the electron transport region is not limited thereto. Theelectron transport layer may have a single-layered structure or amulti-layered structure including two or more different materials.

Conditions for forming the hole blocking layer, the electron transportlayer, and the electron injection layer which constitute the electrontransport region may be understood by referring to the conditions forforming the hole injection layer.

When the electron transport region includes a hole blocking layer, thehole blocking layer may include, for example, BCP, BPhen, BAlq, or anycombination thereof, but embodiments of the present disclosure are notlimited thereto:

A thickness of the hole blocking layer may be from about 20 Å to about1,000 Å, for example, about 30 Å to about 300 Å. While not wishing to bebound by theory, it is understood that when the thickness of the holeblocking layer is within these ranges, the hole blocking layer may haveexcellent hole blocking characteristics without a substantial increasein driving voltage.

The electron transport layer may include BOP, BPhen, Alq₃, BAlq, TAZ,NTAZ, or any combination thereof:

In one or more embodiments, the electron transport layer may include atleast one of ET1 to ET25, but are not limited thereto:

A thickness of the electron transport layer may be from about 100 Å toabout 1,000 Å, for example, about 150 Å to about 500 Å. While notwishing to be bound by theory, it is understood that when the thicknessof the electron transport layer is within the range described above, theelectron transport layer may have satisfactory electron transportcharacteristics without a substantial increase in driving voltage.

Also, the electron transport layer may further include, in addition tothe materials described above, a metal-containing material.

The metal-containing material may include a Li complex. The Li complexmay include, for example, Compound ET-D1 (LiQ), Compound ET-D2, orcombination thereof:

The electron transport region may include an electron injection layerthat promotes flow of electrons from the second electrode 19 thereinto.

The electron injection layer may include LiF, NaCl, CsF, Li₂O, BaO, orany combination thereof.

A thickness of the electron injection layer may be from about 1 Å toabout 100 Å, for example, about 3 Å to about 90 Å. While not wishing tobe bound by theory, it is understood that when a thickness of theelectron injection layer is within these ranges, satisfactory electroninjection characteristics may be obtained without substantial increasein driving voltage.

The second electrode 19 is disposed on the organic layer 15. The secondelectrode 19 may be a cathode. A material for forming the secondelectrode 19 may be a metal, an alloy, an electrically conductivecompound, or a combination thereof, which have a relatively low workfunction. For example, lithium (Li), magnesium (Mg), aluminum (Al),aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), ormagnesium-silver (Mg—Ag) may be formed as the material for forming thesecond electrode 19. To manufacture a top-emission type light-emittingdevice, a transmissive electrode formed using ITO or IZO may be used asthe second electrode 19.

Hereinbefore, the organic light-emitting device according to anembodiment has been described in connection with the FIGURE.

Another aspect of the present disclosure provides a diagnosticcomposition including at least one of the organometallic compoundrepresented by Formula 1.

The organometallic compound represented by Formula 1 provides highluminescent efficiency. Accordingly, a diagnostic composition includingthe organometallic compound may have high diagnostic efficiency.

The diagnostic composition may be used in various applications includinga diagnosis kit, a diagnosis reagent, a biosensor, and a biomarker.

The term “C₁-C₆₀ alkyl group” as used herein refers to a linear orbranched saturated aliphatic hydrocarbon monovalent group having 1 to 60carbon atoms, and examples thereof include a methyl group, an ethylgroup, a propyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a pentyl group, an isoamyl group, and a hexyl group.The term “C₁-C₆₀ alkylene group” as used herein refers to a divalentgroup having the same structure as the C₁-C₆₀ alkyl group.

The term “C₁-C₆₀ alkoxy group” as used herein refers to a monovalentgroup represented by —OA₁₀₁ (wherein A₁₀₁ is the C₁-C₆₀ alkyl group),and examples thereof include a methoxy group, an ethoxy group, and aniso-propyloxy group.

The term “C₂-C₆₀ alkenyl group” as used herein refers to a hydrocarbongroup having at least one carbon-carbon double bond in the middle or atthe terminus of the C₂-C₆₀ alkyl group, and examples thereof include anethenyl group, a propenyl group, and a butenyl group. The term “C₂-C₆₀alkenylene group” as used herein refers to a divalent group having thesame structure as the C₂-C₆₀ alkenyl group.

The term “C₂-C₆₀ alkynyl group” as used herein refers to a hydrocarbongroup having at least one carbon-carbon triple bond in the middle or atthe terminus of the C₂-C₆₀ alkyl group, and examples thereof include anethynyl group, and a propynyl group. The term “C₂-C₆₀ alkynylene group”as used herein refers to a divalent group having the same structure asthe C₂-C₆₀ alkynyl group.

The term “C₃-C₁₀ cycloalkyl group” as used herein refers to a monovalentsaturated hydrocarbon monocyclic group having 3 to 10 carbon atoms, andnon-limiting examples thereof include a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cycloctyl group, an adamantanyl group, anorbornanyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexylgroup, a bicyclo[2.2.1]heptyl group, and a bicyclo[2.2.2]octyl group.The term “C₃-C₁₀ cycloalkylene group” as used herein refers to adivalent group having the same structure as the C₃-C₁₀ cycloalkyl group.

The term “C₁-C₁₀ heterocycloalkyl group” as used herein refers to amonovalent saturated monocyclic group having at least one heteroatomselected from N, O, P, Si and S as a ring-forming atom and 1 to 10carbon atoms, and non-limiting examples thereof include atetrahydrofuranyl group and a tetrahydrothiophenyl group. The term“C₁-C₁₀ heterocycloalkylene group” as used herein refers to a divalentgroup having the same structure as the C₁-C₁₀ heterocycloalkyl group.

The term “C₃-C₁₀ cycloalkenyl group” as used herein refers to amonovalent monocyclic group that has 3 to 10 carbon atom, at least onecarbon-carbon double bond in its ring, and no aromaticity, and anon-limiting example thereof includes a cycloheptenyl group. The term“C₃-C₁₀ cycloalkenylene group” as used herein refers to a divalent grouphaving the same structure as the C₃-C₁₀ cycloalkenyl group.

The term “C₁-C₁₀ heterocycloalkenyl group” as used herein refers to amonovalent monocyclic group that has at least one heteroatom selectedfrom N, O, P, Si, and S as a ring-forming atom, 1 to 10 carbon atoms,and at least one double bond in its ring. Non-limiting examples of theC₁-C₁₀ heterocycloalkenyl group include a 2,3-dihydrofuranyl group and a2,3-dihydrothiophenyl group. The term “C₁-C₁₀ heterocycloalkenylenegroup” as used herein refers to a divalent group having the samestructure as the C₁-C₁₀ heterocycloalkenyl group.

The term “C₆-C₆₀ aryl group” as used herein refers to a monovalent grouphaving a monovalent carbocyclic aromatic system having 6 to 60 carbonatoms, and the term “C₆-C₆₀ arylene group” as used herein refers to adivalent group having a carbocyclic aromatic system having 6 to 60carbon atoms. Non-limiting examples of the C₆-C₆₀ aryl group include aphenyl group, a naphthyl group, an anthracenyl group, a phenanthrenylgroup, a pyrenyl group, and a chrysenyl group. When the C₆-C₆₀ arylgroup and the C₆-C₆₀ arylene group each include two or more rings, therings may be fused to each other.

The term “C₁-C₆₀ heteroaryl group” as used herein refers to a monovalentgroup having a heterocyclic aromatic system that has at least oneheteroatom selected from N, O, P, Si, and S as a ring-forming atom, inaddition to 1 to 60 carbon atoms. The term “C₁-C₆₀ heteroarylene group”as used herein refers to a divalent group having a heterocyclic aromaticsystem that has at least one heteroatom selected from N, O, P, Si, and Sas a ring-forming atom, in addition to 1 to 60 carbon atoms.Non-limiting examples of the C₁-C₆₀ heteroaryl group include a pyridinylgroup, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, atriazinyl group, a quinolinyl group, and an isoquinolinyl group. Whenthe C₁-C₆₀ heteroaryl group and the C₁-C₆₀ heteroarylene group eachinclude two or more rings, the rings may be fused to each other.

The term “C₆-C₆₀ aryloxy group” as used herein indicates —OA₁₀₂ (whereinA₁₀₂ is the C₆-C₆₀ aryl group), the term “C₆-C₆₀ arylthio group” as usedherein indicates —SA₁₀₃ (wherein A₁₀₃ is the C₆-C₆₀ aryl group), and theterm “C₇-C₆₀ arylalkyl group” as used herein indicates -A₁₀₄A₁₀₅(wherein A₁₀₅ is the C₆-C₅₉ aryl group and A₁₀₄ is the C₁-C₅₃ alkylenegroup).

The term “C₁-C₆₀ heteroaryloxy group” as used herein refers to —OA₁₀₆(wherein A₁₀₆ is the C₂-C₆₀ heteroaryl group), the term “C₁-C₆₀heteroarylthio group” as used herein indicates —SA₁₀₇ (wherein A₁₀₇ isthe C₁-C₆₀ heteroaryl group), and the term “C₂-C₆₀ heteroarylalkylgroup” as used herein refers to -A₁₀₈A₁₀₉ (A₁₀₉ is a C₁-C₅₉ heteroarylgroup, and A₁₀₈ is a C₁-C₅₉ alkylene group).

The term “monovalent non-aromatic condensed polycyclic group” as usedherein refers to a monovalent group (for example, having 8 to 60 carbonatoms) having two or more rings condensed to each other, only carbonatoms as ring-forming atoms, and no aromaticity in its entire molecularstructure. A non-limiting example of the monovalent non-aromaticcondensed polycyclic group includes a fluorenyl group. The term“divalent non-aromatic condensed polycyclic group” as used herein refersto a divalent group having the same structure as the monovalentnon-aromatic condensed polycyclic group.

The term “monovalent non-aromatic condensed heteropolycyclic group” asused herein refers to a monovalent group (for example, having 2 to 60carbon atoms) having two or more rings condensed to each other, aheteroatom selected from N, O, P, Si, and S, other than carbon atoms, asa ring-forming atom, and no aromaticity in its entire molecularstructure. A non-limiting example of the monovalent non-aromaticcondensed heteropolycyclic group includes a carbazolyl group. The term“divalent non-aromatic condensed heteropolycyclic group” as used hereinrefers to a divalent group having the same structure as the monovalentnon-aromatic condensed heteropolycyclic group.

The term “C₅-C₆₀ carbocyclic group” as used herein refers to a saturatedor unsaturated cyclic group having, as a ring-forming atom, 5 to 60carbon atoms only. The C₅-C₆₀ carbocyclic group may be a monocyclicgroup or a polycyclic group.

The term “C₁-C₆₀ heterocyclic group” as used herein refers to asaturated or unsaturated cyclic group having, as a ring-forming atom, atleast one heteroatom selected from N, O, Si, P, and S other than 1 to 60carbon atoms. The C₁-C₆₀ heterocyclic group may be a monocyclic group ora polycyclic group.

A substituent(s) of the substituted C₁-C₆₀ alkyl group, the substitutedC₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group, thesubstituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkylgroup, the substituted C₁-C₁₀ heterocycloalkyl group, the substitutedC₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀ heterocycloalkenylgroup, the substituted C₆-C₆₀ aryl group, the substituted C₆-C₆₀ aryloxygroup, the substituted C₆-C₆₀ arylthio group, the substituted C₇-C₆₀arylalkyl group, the substituted C₁-C₆₀ heteroaryl group, thesubstituted C₁-C₆₀ heteroaryloxy group, the substituted C₁-C₆₀heteroarylthio group, the substituted C₂-C₆₀ heteroarylalkyl group, thesubstituted monovalent non-aromatic condensed polycyclic group, and thesubstituted monovalent non-aromatic condensed heteropolycyclic group mayeach independently be:

-   -   deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H,        —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino        group, an amidino group, a hydrazine group, a hydrazone group, a        carboxylic acid group or a salt thereof, a sulfonic acid group        or a salt thereof, a phosphoric acid group or a salt thereof, a        C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, or a C₁-C₆₀ alkoxy group;    -   a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, or a C₁-C₆₀ alkoxy group, each substituted with        deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H,        —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino        group, an amidino group, a hydrazine group, a hydrazone group, a        carboxylic acid group or a salt thereof, a sulfonic acid group        or a salt thereof, a phosphoric acid group or a salt thereof, a        C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₇-C₆₀ arylalkyl group, a C₁-C₆₀ heteroaryl group, a        C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a        C₂-C₆₀ heteroarylalkyl group, a monovalent non-aromatic        condensed polycyclic group, a monovalent non-aromatic condensed        heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅),        —Ge(Q₁₃)(Q₁₄)(Q₁₅), —B(Q₁₆)(Q₁₇), —P(═O)(Q₁₈)(Q₁₉),        —P(Q₁₈)(Q₁₉), or any combination thereof;    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₇-C₆₀ arylalkyl group, a C₁-C₆₀ heteroaryl group, a        C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a        C₂-C₆₀ heteroarylalkyl group, a monovalent non-aromatic        condensed polycyclic group, or a monovalent non-aromatic        condensed heteropolycyclic group;    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₇-C₆₀ arylalkyl group, a C₁-C₆₀ heteroaryl group, a        C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a        C₂-C₆₀ heteroarylalkyl group, a monovalent non-aromatic        condensed polycyclic group, or a monovalent non-aromatic        condensed heteropolycyclic group, each substituted with        deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H,        —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino        group, an amidino group, a hydrazine group, a hydrazone group, a        carboxylic acid group or a salt thereof, a sulfonic acid group        or a salt thereof, a phosphoric acid group or a salt thereof, a        C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a        C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a        C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀        aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ arylalkyl        group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group,        a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroarylalkyl group, a        monovalent non-aromatic condensed polycyclic group, a monovalent        non-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂),        —Si(Q₂₃)(Q₂₄)(Q₂₅), —Ge(Q₂₃)(Q₂₄)(Q₂₅), —B(Q₂₆)(Q₂₇),        —P(═O)(Q₂₈)(Q₂₉), —P(Q₂₈)(Q₂₉), or any combination thereof;    -   —N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), —Ge(Q₃₃)(Q₃₄)(Q₃₅),        —B(Q₃₆)(Q₃₇), —P(═O)(Q₃₈)(Q₃₉), or —P(Q₃₈)(Q₃₉), or    -   any combination thereof.

In the present specification, Q₁ to Q₉, Q₁₁ to Q₁₉, Q₂₁ to Q₂₉, and Q₃₁to Q₃₉ may each independently be hydrogen; deuterium; —F; —Cl; —Br; —I;a hydroxyl group; a cyano group; a nitro group; an amino group; anamidino group; a hydrazine group; a hydrazone group; a carboxylic acidgroup or a salt thereof; a sulfonic acid group or a salt thereof; aphosphoric acid group or a salt thereof; a C₁-C₆₀ alkyl group; a C₂-C₆₀alkenyl group; a C₂-C₆₉ alkynyl group; a C₁-C₆₀ alkoxy group; a C₃-C₁₀cycloalkyl group; a C₁-C₁₀ heterocycloalkyl group; a C₃-C₁₀ cycloalkenylgroup; a C₁-C₁₀ heterocycloalkenyl group; a C₆-C₆₉ aryl group; a C₆-C₆₉aryl group substituted with a C₁-C₆₀ alkyl group, a C₆-C₆₉ aryl group,or any combination thereof; a C₆-C₆₉ aryloxy group; a C₆-C₆₉ arylthiogroup; a C₇-C₆₉ arylalkyl group; a C₁-C₆₀ heteroaryl group; a C₁-C₆₀heteroaryloxy group; a C₁-C₆₀ heteroarylthio group; a C₂-C₆₀heteroarylalkyl group; a monovalent non-aromatic condensed polycyclicgroup, or a monovalent non-aromatic condensed heteropolycyclic group.

Hereinafter, a compound and an organic light-emitting device accordingto embodiments are described in detail with reference to SynthesisExample and Examples. However, the organic light-emitting device is notlimited thereto. The wording “B was used instead of A” used indescribing Synthesis Examples means that an amount of A used wasidentical to an amount of B used, in terms of a molar equivalent.

EXAMPLES Synthesis Example 1: Synthesis of Compound 2

Synthesis of Intermediate 2-L1

1-bromo-6-(sec-butyl)isoquinoline (5.48 grams (g), 20.76 millimoles,mmol), (3,5-dimethylphenyl)boronic acid (4.67 g, 31.14 mmol), Pd(PPh₃)₄(1.92 g, 1.66 mmol), and K₂CO₃ (7.17 g, 51.90 mmol), tetrahydrofuran(THF) (60 milliliters, mL), and distilled water (30 mL) were mixedtogether, and the mixed solution was stirred under reflux for 18 hours.Then, the reaction temperature was lowered to room temperature, and thereaction mixture was extracted by using methylene chloride (MC). Theorganic layer was dried by using anhydrous magnesium sulfate (MgSO₄) toremove moisture, and filtered. The filtrate was decompressed, and theresidue was purified by using column chromatography under conditions ofEA:Hexane=1:10, thereby obtaining 5.60 g (93%) of Intermediate 2-L1.

MALDI-TOFMS (m/z): C₂₁H₂₃N (M+) 289.

Synthesis of Intermediate 2-L2

Intermediate 2-L1 (5.58 g, 19.3 mmol), iridium chloride (3.02 g, 8.58mmol), ethoxyethanol (45 mL), and distilled water (15 mL) were mixedtogether, and the mixed solution was stirred under reflux for 24 hours.The reaction temperature was lowered to room temperature, and a solidproduced therefrom was separated by filtration. A filtrate wasthoroughly washed by using water/methanol/hexane in the stated order,and a solid obtained therefrom was dried in a vacuum oven, therebyobtaining 3.9 g (57%) of Intermediate 2-L2.

Synthesis of Compound 2

Intermediate 2-L2 (1.56 g, 0.97 mmol),3,3,7,7-tetramethylnonane-4,6-dione (2.06 g, 9.69 mmol), Na₂CO₃ (1.02 g,9.69 mmol), and ethoxyethanol (20 mL) were mixed together, and the mixedsolution was stirred for 24 hours. The mixture obtained therefrom wasfiltered, and the filtered solid was thoroughly washed by using ethanoland hexane, and purified by using column chromatography under conditionsof dichloromethane:n-hexane=1:1 (v/v), thereby obtaining 1.40 g (74%) ofCompound 2.

HRMS(MALDI) calcd for C₅₅H₆₇IrN₂O₂: m/z 980.37. Found: 980.39.

Synthesis Example 2: Synthesis of Compound 1

Compound 1 (74%) was obtained in the same manner as in the synthesis ofCompound 2 of Synthesis Example 1, except that2,2,6,6-tetramethylheptane-3,5-dione (9.69 mmol) was used instead of3,3,7,7-tetramethylnonane-4,6-dione.

HRMS(MALDI) calcd for C₅₃H₆₃IrN₂O₂: m/z 952.37. Found: 952.39.

Synthesis Example 3: Synthesis of Compound 3

Compound 3 (74%) was obtained in the same manner as in the synthesis ofCompound 2 of Synthesis Example 1, except that3,7-diethyl-3,7-dimethylnonane-4,6-dione (9.69 mmol) was used instead of3,3,7,7-tetramethylnonane-4,6-dione.

HRMS(MALDI) calcd for C₅₇H₇₁IrN₂O₂: m/z 1008.37. Found: 1008.39.

Evaluation Example 1: Evaluation of HOMO and LUMO Energy Levels

According to the methods shown in Table 2, HOMO and LUMO energy levelsof Compounds 1 to 3 were evaluated. The results are shown in Table 3.

TABLE 2 HOMO energy Cyclic voltammetry (CV) (electrolyte: 0.1MBu₄NClO₄/solvent: CH₂Cl₂/ level evaluation electrode: 3-electrode system(working electrode: GC, reference method electrode: Ag/AgCl, auxiliaryelectrode: Pt)) was used to obtain a voltage (V)-current (A) graph foreach compound. Then, a HOMO energy level of each compound was calculatedfrom a reduction onset of the graph. LUMO energy Each compound wasdiluted in CHCl₃ at a concentration of 1 × 10⁻⁵M, level evaluation and aShimadzu UV-350 spectrometer was used to measure UB method absorptionspectra at room temperature. Then, a LUMO energy level was calculated byusing an optical band gap (E_(g)) from the edge of the UV absorptionspectrum.

TABLE 3 Compound No. HOMO (eV) LUMO (eV) 1 −5.071 −2.410 2 −5.060 −2.4013 −5.060 −2.401

Referring to Table 3, it was confirmed that Compounds 1 to 3 hadsuitable electrical characteristics for use as materials for organiclight-emitting devices.

Evaluation Example 2: Evaluation of Photoluminescence Quantum Yield(PLQY)

PMMA solution in CH₂Cl₂ was mixed with 5 percent by weight (weight %) ofa mixture including CBP and Compound 2 (wherein an amount of Compound 2was 10 parts by weight of 100 parts by weight of the mixture). Theresulting product was spin-coated on a quartz substrate, and thesubstrate was heat-treated in an oven at a temperature of 80° C., andthen, cooled to room temperature, thereby preparing a film.

A PLQY in film of Compound 2 was evaluated by using a HamamatsuPhotonics absolute PL quantum yield measurement system using a xenonlight source, equipped with a monochromator, a photonic multichannelanalyzer, and an integrating sphere, and utilizing a PLQY measurementsoftware (Hamamatsu Photonics, Ltd., Shizuoka, Japan). The same processwas repeated with respect to Compounds 1, 3, and C, and the results areshown in Table 4.

TABLE 4 Compound No. Compound 1 Compound 2 Compound 3 Compound C PLQY0.837 0.905 0.917 0.734 1

2

3

C

Referring to Table 4, it was confirmed that Compounds 1 to 3 each had agreater PLQY in film than Compound C.

Evaluation Example 3: Measurement of Decay Time

A quarts substrate washed with chloroform and pure water was preparedfirst, and predetermined materials shown in Table 5 werevacuum-(co)-deposited on the quarts substrate at a vacuum degree of 10⁻⁷torr, thereby preparing Films 1 to 3, each having a thickness of 50 nm.

TABLE 5 Film No. Compound used in film preparation Film 1 CBP:Compound 1(at a weight ratio of 9:1) Film 2 CBP:Compound 2 (at a weight ratio of9:1) Film 3 CBP:Compound 3 (at a weight ratio of 9:1)

Subsequently, a PL spectrum of Film 1 prepared as described above wasevaluated at room temperature by using FluoTime 300 which is a TRPLmeasurement system manufactured by PicoQuant Company and a PLS340(excitation wavelength=340 nm, spectral width=20 nm) which is a pumpingsource manufactured by PicoQuant Company. Then, a wavelength of the mainpeak of the spectrum was determined, and the number of photons emittedat the wavelength of the main film upon a photon pulse (pulse width=500picoseconds) applied on each film by the PLS340 was measured based onthe Time-Correlated Single Photon Counting (TCSPC). This measurement wasrepeated to obtain a TRPL curve with sufficient fitting. Two or moreexponential decay functions were fitted to the obtained results toobtain T_(decay)(E_(x)), i.e., decay time, of Film 1, and the resultsare shown in Table 6. The functions used for the fitting is shown inEquation 1 below, and the greatest value among T_(decay) values obtainedfrom each exponential decay function used in the fitting was indicatesas T_(decay)(E_(x)). Here, during the measurement time equal to themeasurement time used to obtain the TRPL curve, the same measurement wasrepeated one more time in a dark state (i.e., a state where a pumpingsignal incident on the predetermined film was blocked) to obtain abaseline curve or a background signal curve to be used as a baseline forthe fitting. The same process was repeated for Films 2 and 3, and theresults are shown in Table 6.

$\begin{matrix}{{f(t)} = {\sum\limits_{i = 1}^{n}{A_{i}\mspace{14mu}\exp\mspace{11mu}\left( {{- t}\text{/}T_{{decay},i}} \right)}}} & {{Equation}\mspace{14mu} 1}\end{matrix}$

TABLE 6 Film No. Decay time (μs) Film 1 (Compound 1) 0.950 Film 2(Compound 2) 0.995 Film 3 (Compound 3) 0.993

Referring to Table 6, it was confirmed that Compounds 1 to 3 each hadexcellent decay time.

Example 1

As an anode, a glass substrate on which ITO/Ag/ITO was formed to athickness of 70 Å/1,000 Å/70 Å was cut to a size of 50 mm×50 mm×0.5 mm,sonicated with isopropyl alcohol and pure water each for 5 minutes, andthen, cleaned by exposure to ultraviolet rays and ozone for 30 minutes.Then, the anode was provided to a vacuum deposition apparatus.

2-TNATA was vacuum-deposited on the anode to form a hole injection layerhaving a thickness of 600 Å, and4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (hereinafter, referred toas NPB) was vacuum-deposited on the hole injection layer to form a holetransport layer having a thickness of 1,350 Å.

Next, CBP (as a host) and Compound 1 (as a dopant) were co-deposited ata weight ratio of 98:2 on the hole transport layer to form an emissionlayer having a thickness of 400 Å.

Then, BCP was vacuum-deposited on the emission layer to form a holeblocking layer having a thickness of 50 Å, and Alq₃ was vacuum-depositedon the hole blocking layer to form an electron transport layer having athickness of 350 Å. LiF was vacuum-deposited on the electron transportlayer to form an electron injection layer having a thickness of 10 Å,and Mg and Ag were co-deposited at a weight ratio of 90:10 on theelectron injection layer to form a cathode having a thickness of 120 Å,thereby completing the manufacture of an organic light-emitting device:

Examples 2 and 3 and Comparative Examples A to C

Organic light-emitting devices were manufactured in the same manner asin Example 1, except that compounds listed in Table 7 below were eachused as a dopant instead of Compound 1 in forming an emission layer.

Evaluation Example 4: Evaluation of Characteristics of OrganicLight-Emitting Device

The driving voltage, current density, maximum external quantumefficiency (Max EQE), roll-off ratio, emission peak wavelength of ELspectrum, FWHM of EL spectrum, emission color, color coordinates(CIE_(x)), and/or lifespan (T₉₇) of the organic light-emitting devicesmanufactured according to Examples 1 to 3 and Comparative Examples A toC were evaluated, and the results are shown in Table 7. Here, as adevice used for the evaluation, a current-voltage meter (Keithley 2400)and a luminance meter (Minolta Cs-1000A) were used. The lifespan (T₉₇)(at 3,500 nit) was obtained by evaluating time (hours, hr) that lapsedwhen luminance was 97% of initial luminance (100%). The roll-off ratiowas calculated according to Equation 20 below:Roll off ratio={1−(efficiency (at 3,500 nit)/maximum luminanceefficiency)}×100%  Equation 20

TABLE 7 Compound No. of Emission dopant in Driving Current Max peakColor emission voltage density EQE Roll-off wavelength FWHM Emissioncoordinate LT₉₇ layer (V) (mA/cm²) (%) Ratio (%) (nm) (nm) color(ClE_(x)) (hr) Example 1 1 5.20 5.71 28.0 15 626 54 Red 0.684 252Example 2 2 5.16 6.40 28.2 15 625 51 Red 0.677 280 Example 3 3 5.11 6.4628.6 14 624 49 Red 0.674 306 Comparative A 5.22 8.01 24.1 19 — 60 Red0.683 200 Example A Comparative B 5.32 6.98 25.6 16 624 55 Red 0.675 210Example B Comparative C 5.42 7.11 24.1 19 634 60 Red 0.683 210 Example C1

2

3

A

B

C

Referring to Table 7, it was confirmed that the organic light-emittingdevices manufactured according to Examples 1 to 3 emitted red lighthaving excellent color purity, and also had an improved driving voltage,an improved external quantum efficiency, an improved roll-off ratio, andan improved lifespan, as compared with the organic light-emittingdevices manufactured according to Comparative Examples A to C.

According to the one or more embodiments, the organometallic compoundhas excellent electric characteristics and stability, and thus, anelectronic device, for example, an organic light-emitting device,including the organometallic compound may have a low driving voltage,good external quantum efficiency, a low roll-off ratio, and a longlifespan. In addition, since the organometallic compound has excellentphosphorescence characteristics, a diagnostic composition including theorganometallic compound may be provided with a high diagnosisefficiency.

It should be understood that embodiments described herein should beconsidered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each embodimentshould typically be considered as available for other similar featuresor aspects in other embodiments.

While one or more embodiments have been described with reference to theFIGURES, it will be understood by those of ordinary skill in the artthat various changes in form and details may be made therein withoutdeparting from the spirit and scope of the present disclosure as definedby the following claims.

What is claimed is:
 1. An organometallic compound represented by Formula1:

wherein, in Formula 1, R₁ to R₃ and R₅ to R₁₀ are each independentlyhydrogen, deuterium, —F, —Cl, —Br, —I, —SF₅, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkylgroup, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₇-C₆₀ arylalkyl group, a substituted orunsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstitutedC₁-C₆₀ heteroaryloxy group, a substituted or unsubstituted C₁-C₆₀heteroarylthio group, a substituted or unsubstituted C₂-C₆₀heteroarylalkyl group, a substituted or unsubstituted monovalentnon-aromatic condensed polycyclic group, a substituted or unsubstitutedmonovalent non-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂),—Si(Q₃)(Q₄)(Q₅), —Ge(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), —P(═O)(Q₈)(Q₉), or—P(Q₈)(Q₉), is a substituted or unsubstituted C₂-C₆₀ alkyl group, or asubstituted or unsubstituted C₃-C₁₀ cycloalkyl group, A₁ to A₆ are eachindependently a substituted or unsubstituted C₁-C₆₀ alkyl group, asubstituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, asubstituted or unsubstituted C₇-C₆₀ arylalkyl group, or a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group,provided that at least one of A₁ to A₆ is a C₂-C₆₀ alkyl group, A7 ishydrogen or deuterium, two or more of R₁ to R₃ and R₅ to R₁₀ areoptionally linked to form a C₅-C₆₀ carbocyclic group unsubstituted orsubstituted with at least one R_(1a) or a C₁-C₆₀ heterocyclic groupunsubstituted or substituted with at least one R_(1a), two or more of A₁to A₆ are optionally linked to form a C₅-C₆₀ carbocyclic groupunsubstituted or substituted with at least one R_(1a); R_(1a) is thesame as defined in connection with R₇, a substituent(s) of thesubstituted C₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenyl group,the substituted C₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxygroup, the substituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₁₀heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, thesubstituted C₁-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ arylgroup, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀arylthio group, the substituted C₇-C₆₀ arylalkyl group, the substitutedC₁-C₆₀ heteroaryl group, the substituted C₁-C₆₀ heteroaryloxy group, thesubstituted C₁-C₆₀ heteroarylthio group, the substituted C₂-C₆₀heteroarylalkyl group, the substituted monovalent non-aromatic condensedpolycyclic group, and the substituted monovalent non-aromatic condensedheteropolycyclic group is each independently: deuterium, —F, —Cl, —Br,—I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, or a C₁-C₆₀ alkoxy group; a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenylgroup, a C₂-C₆₀ alkynyl group, or C₁-C₆₀ alkoxy group, each substitutedwith deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H,—CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino group,an amidino group, a hydrazine group, a hydrazone group, a carboxylicacid group or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof, a C₃-C₁₀ cycloalkyl group, aC₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₇-C₆₀ arylalkyl group, a C₁-C₆₀ heteroarylgroup, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, aC₂-C₆₀ heteroarylalkyl group, a monovalent non-aromatic condensedpolycyclic group, a monovalent non-aromatic condensed heteropolycyclicgroup, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), —Ge(Q₁₃)(Q₁₄)(Q₁₅),—B(Q₁₆)(Q₁₇), —P(═O)(Q₁₈)(Q₁₉), —P(Q₁₈)(Q₁₉), or any combinationthereof; a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, aC₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀arylalkyl group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxygroup, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroarylalkyl group, amonovalent non-aromatic condensed polycyclic group, or a monovalentnon-aromatic condensed heteropolycyclic group; a C₃-C₁₀ cycloalkylgroup, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, aC₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxygroup, a C₆-C₆₀ arylthio group, a C₇-C₆₀ arylalkyl group, a C₁-C₆₀heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthiogroup, a C₂-C₆₀ heteroarylalkyl group, a monovalent non-aromaticcondensed polycyclic group, or a monovalent non-aromatic condensedheteropolycyclic group, each substituted with deuterium, —F, —Cl, —Br,—I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyanogroup, a nitro group, an amino group, an amidino group, a hydrazinegroup, a hydrazone group, a carboxylic acid group or a salt thereof, asulfonic acid group or a salt thereof, a phosphoric acid group or a saltthereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynylgroup, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, aC₆-C₆₀ arylthio group, a C₇-C₆₀ arylalkyl group, a C₁-C₆₀ heteroarylgroup, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, aC₂-C₆₀ heteroarylalkyl group, a monovalent non-aromatic condensedpolycyclic group, a monovalent non-aromatic condensed heteropolycyclicgroup, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), —Ge(Q₂₃)(Q₂₄)(Q₂₅),—B(Q₂₆)(Q₂₇), —P(═O)(Q₂₈)(Q₂₉), —P(Q₂₈)(Q₂₉), or any combinationthereof; —N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), —Ge(Q₃₃)(Q₃₄)(Q₃₅),—B(Q₃₆)(Q₃₇), —P(═O)(Q₃₈)(Q₃₉), —P(Q₃₈)(Q₃₉), or any combinationthereof; or any combination thereof, and Q₁ to Q₉, Q₁₁ to Q₁₉, Q₂₁ toQ₂₉, and Q₃₁ to Q₃₉ are each independently hydrogen; deuterium; —F; —Cl;—Br; —I; a hydroxyl group; a cyano group; a nitro group; an amino group;an amidino group; a hydrazine group; a hydrazone group; a carboxylicacid group or a salt thereof, a sulfonic acid group or a salt thereof, aphosphoric acid group or a salt thereof; a C₁-C₆₀ alkyl group; a C₂-C₆₀alkenyl group; a C₂-C₆₀ alkynyl group; a C₁-C₆₀ alkoxy group; a C₃-C₁₀cycloalkyl group; a C₁-C₁₀ heterocycloalkyl group; a C₃-C₁₀ cycloalkenylgroup; a C₁-C₁₀ heterocycloalkenyl group; a C₆-C₆₀ aryl group; a C₆-C₆₀aryl group substituted with a C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl group orany combination thereof, a C₆-C₆₀ aryloxy group; a C₆-C₆₀ arylthiogroup; a C₇-C₆₀ arylalkyl group; a C₁-C₆₀ heteroaryl group; a C₁-C₆₀heteroaryloxy group; a C₁-C₆₀ heteroarylthio group; a C₂-C₆₀heteroarylalkyl group; a monovalent non-aromatic condensed polycyclicgroup; or a monovalent non-aromatic condensed heteropolycyclic group. 2.The organometallic compound of claim 1, wherein R₁ to R₃ and R₅ to R₁₀are each independently: hydrogen, deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, —SF₅, a C₁-C₂₀ alkyl group, or a C₁-C₂₀alkoxy group; a C₁-C₂₀ alkyl group or a C₁-C₂₀ alkoxy group, eachsubstituted with deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃,—CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₁₀ alkylgroup, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, acycloheptyl group, a cycloctyl group, an adamantanyl group, anorbornanyl group, a norbornenyl group, a cyclopentenyl group, acyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group,a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, abicyclo[2.2.2]octyl group, a phenyl group, a (C₁-C₂₀ alkyl)phenyl group,a biphenyl group, a terphenyl group, a naphthyl group, a pyridinylgroup, a pyrimidinyl group, or a combination thereof; a cyclopentylgroup, a cyclohexyl group, a cycloheptyl group, a cycloctyl group, anadamantanyl group, a norbornanyl group, a norbornenyl group, acyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, abicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, abicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a phenyl group,a (C₁-C₂₀ alkyl)phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenylgroup, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group,an imidazolyl group, a pyrazolyl group, a thiazolyl group, anisothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinylgroup, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, anisoindolyl group, an indolyl group, an indazolyl group, a purinyl group,a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a cinnolinyl group, acarbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, abenzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group,a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, atetrazolyl group, an oxadiazolyl group, a triazinyl group, adibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolylgroup, a dibenzocarbazolyl group, an imidazopyridinyl group, or animidazopyrimidinyl group, each unsubstituted or substituted withdeuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, ahydroxyl group, a cyano group, a nitro group, an amino group, an amidinogroup, a hydrazine group, a hydrazone group, a carboxylic acid group ora salt thereof, a sulfonic acid group or a salt thereof, a phosphoricacid group or a salt thereof, a C₁-C₁₀ alkyl group, a C₁-C₂₀ alkoxygroup, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, acycloctyl group, an adamantanyl group, a norbornanyl group, anorbornenyl group, a cyclopentenyl group, a cyclohexenyl group, acycloheptenyl group, a bicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexylgroup, a bicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, aphenyl group, a (C₁-C₂₀ alkyl)phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenylgroup, an anthracenyl group, a fluoranthenyl group, a triphenylenylgroup, a pyrenyl group, a chrysenyl group, a pyrrolyl group, athiophenyl group, a furanyl group, an imidazolyl group, a pyrazolylgroup, a thiazolyl group, an isothiazolyl group, an oxazolyl group, anisoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinylgroup, a pyridazinyl group, an isoindolyl group, an indolyl group, anindazolyl group, a purinyl group, a quinolinyl group, an isoquinolinylgroup, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinylgroup, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group,a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group,an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolylgroup, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, atriazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, abenzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinylgroup, an imidazopyrimidinyl group, or any combination thereof;—N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), or —P(═O)(Q₈)(Q₉); or anycombination thereof, is: a C₂-C₂₀ alkyl group unsubstituted orsubstituted with deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃,—CF₂H, —CFH₂, a cyano group, a cyclopentyl group, a cyclohexyl group, acycloheptyl group, a cycloctyl group, an adamantanyl group, anorbornanyl group, a norbornenyl group, a cyclopentenyl group, acyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentyl group,a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, abicyclo[2.2.2]octyl group, or any combination thereof; or a cyclopentylgroup, a cyclohexyl group, a cycloheptyl group, a cycloctyl group, anadamantanyl group, a norbornanyl group, a norbornenyl group, acyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, abicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, abicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, eachunsubstituted or substituted with deuterium, —F, —Cl, —Br, —CD₃, —CD₂H,—CDH₂, —CF₃, —CF₂H, —CFH₂, a cyano group, a C₁-C₁₀ alkyl group, acyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cycloctylgroup, an adamantanyl group, a norbornanyl group, a norbornenyl group, acyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, abicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, abicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, or anycombination thereof; and Q₁ to Q₉ are each independently: —CH₃, —CD₃,—CD₂H, —CDH₂, —CH₂CH₃, —CH₂CD₃, —CH₂CD₂H, —CH₂CDH₂, —CHDCH₃, —CHDCD₂H,—CHDCDH₂, —CHDCD₃, —CD₂CD₃, —CD₂CD₂H, or —CD₂CDH₂; or an n-propyl group,an isopropyl group, an n-butyl group, a sec-butyl group, an isobutylgroup, a tert-butyl group, an n-pentyl group, a tert-pentyl group, aneopentyl group, an isopentyl group, a sec-pentyl group, a 3-pentylgroup, a sec-isopentyl group, a phenyl group, a biphenyl group, or anaphthyl group, each unsubstituted or substituted with deuterium, aC₁-C₁₀ alkyl group, a phenyl group, or any combination thereof.
 3. Theorganometallic compound of claim 1, wherein A₁ to A₆ are eachindependently: a C₁-C₂₀ alkyl unsubstituted or substituted withdeuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, acyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cycloctylgroup, an adamantanyl group, a norbornanyl group, a norbornenyl group, acyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, abicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, abicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a phenyl group,a (C₁-C₂₀alkyl)phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, or any combination thereof; or a cyclopentyl group, acyclohexyl group, a cycloheptyl group, a cycloctyl group, an adamantanylgroup, a norbornanyl group, a norbornenyl group, a cyclopentenyl group,a cyclohexenyl group, a cycloheptenyl group, a bicyclo[1.1.1]pentylgroup, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, abicyclo[2.2.2]octyl group, a phenyl group, a (C₁-C₂₀ alkyl)phenyl group,a biphenyl group, a terphenyl group, a naphthyl group, a fluorenylgroup, a phenanthrenyl group, an anthracenyl group, a fluoranthenylgroup, a triphenylenyl group, a pyrenyl group, a chrysenyl group, eachunsubstituted or substituted with deuterium, —F, —Cl, —Br, —I, —CD₃,—CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a cyano group, a C₁-C₁₀ alkyl group, acyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cycloctylgroup, an adamantanyl group, a norbornanyl group, a norbornenyl group, acyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, abicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, abicyclo[2.2.1]heptyl group, a bicyclo[2.2.2]octyl group, a phenyl group,a (C₁-C₂₀ alkyl)phenyl group, a biphenyl group, a terphenyl group, anaphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenylgroup, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, achrysenyl group, or any combination thereof.
 4. The organometalliccompound of claim 1, wherein R₄ is a group represented by Formula 2:

wherein, the number of carbon atoms in Formula 2 is 4 or more, R₁₃ inFormula 2 is hydrogen, deuterium, a C₁-C₂₀ alkyl group,deuterium-containing C₁-C₂₀ alkyl group, a C₃-C₁₀ cycloalkyl group, or adeuterium-containing C₃-C₁₀ cycloalkyl group, R₁₄ and R₁₅ in Formula 2are each independently a C₁-C₂₀ alkyl group, a deuterium-containingC₁-C₂₀ alkyl group, a C₃-C₁₀ cycloalkyl group, or a deuterium-containingC₃-C₁₀ cycloalkyl group, and * indicates a binding site to a neighboringatom.
 5. The organometallic compound of claim 4, wherein R₁₃ in Formula2 is hydrogen or deuterium.
 6. The organometallic compound of claim 4,wherein R₁₄ and R₁₅ in Formula 2 are different from each other.
 7. Theorganometallic compound of claim 4, wherein in Formula 2, R₁₃ ishydrogen, deuterium, —CH₃, —CDH₂, —CD₂H, or —CD₃, R₁₄ and R₁₅ are eachindependently: a methyl group, an ethyl group, an n-propyl group, anisopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group,a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neopentylgroup, an isopentyl group, a sec-pentyl group, a 3-pentyl group, asec-isopentyl group, an n-hexyl group, an isohexyl group, a sec-hexylgroup, a tert-hexyl group, an n-heptyl group, an isoheptyl group, asec-heptyl group, a tert-heptyl group, an n-octyl group, an isooctylgroup, a sec-octyl group, a tert-octyl group, an n-nonyl group, anisononyl group, a sec-nonyl group, a tert-nonyl group, an n-decyl group,an isodecyl group, a sec-decyl group, a tert-decyl group, a cyclopentylgroup, a cyclohexyl group, a cycloheptyl group, a cycloctyl group, abicyclo[1.1.1]pentyl group, a bicyclo[2.1.1]hexyl group, abicyclo[2.2.1]heptyl group, or a bicyclo[2.2.2]octyl group; or a methylgroup, an ethyl group, an n-propyl group, an isopropyl group, an n-butylgroup, a sec-butyl group, an isobutyl group, a tert-butyl group, ann-pentyl group, a tert-pentyl group, a neopentyl group, an isopentylgroup, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, ann-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group,an n-heptyl group, an isoheptyl group, a sec-heptyl group, a tert-heptylgroup, an n-octyl group, an isooctyl group, a sec-octyl group, atert-octyl group, an n-nonyl group, an isononyl group, a sec-nonylgroup, a tert-nonyl group, an n-decyl group, an isodecyl group, asec-decyl group, a tert-decyl group, a cyclopentyl group, a cyclohexylgroup, a cycloheptyl group, a cycloctyl group, a bicyclo[1.1.1]pentylgroup, a bicyclo[2.1.1]hexyl group, a bicyclo[2.2.1]heptyl group, or abicyclo[2.2.2]octyl group, each substituted with at least one deuterium.8. The organometallic compound of claim 1, wherein R₇, and R₉ in Formula1 are each not hydrogen.
 9. The organometallic compound of claim 1,wherein R₇ and R₉ in Formula 1 are each not hydrogen and identical toeach other.
 10. The organometallic compound of claim 1, wherein at leastone of A₁ to A₆ is a substituted or unsubstituted C₂-C₆₀ alkyl group, asubstituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted orunsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstitutedC₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₃-C₁₀cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ arylgroup, a substituted or unsubstituted C₇-C₆₀ arylalkyl group, or asubstituted or unsubstituted monovalent non-aromatic condensedpolycyclic group.
 11. The organometallic compound of claim 1, wherein inFormula 1, at least one of a group represented by *—C(A₁)(A₂)(A₃), agroup represented by *—C(A₄)(A₅)(A₆), or a combination thereof is anadamantane group, a norbornane group, a norbornene group, abicyclo[1.1.1]pentane group, a bicyclo[2.1.1]hexane group, abicyclo[2.2.1]heptane group, a bicyclo[2.2.2]octane group, eachunsubstituted or substituted with at least one R_(1a).
 12. Theorganometallic compound of claim 1, wherein the organometallic compoundis one of Compounds 2, 3, 5, and 6:


13. An organic light-emitting device comprising: a first electrode; asecond electrode; and an organic layer disposed between the firstelectrode and the second electrode and comprising an emission layer,wherein the organic layer comprises at least one organometallic compoundof claim
 1. 14. The organic light-emitting device of claim 13, whereinthe first electrode is an anode, the second electrode is a cathode, theorganic layer further comprises a hole transport disposed between thefirst electrode and the emission layer and an electron transport regiondisposed between the emission layer and the second electrode, the holetransport region comprises a hole injection layer, a hole transportlayer, an electron blocking layer, a buffer layer, or any combinationthereof, and the electron transport region comprises a hole blockinglayer, an electron transport layer, an electron injection layer, or anycombination thereof.
 15. The organic light-emitting device of claim 13,wherein the emission layer comprises the at least one organometalliccompound.
 16. The organic light-emitting device of claim 15, wherein theemission layer emits red light.
 17. The organic light-emitting device ofclaim 15, wherein the emission layer further comprises a host, and anamount of the host in the emission layer is greater than that of theorganometallic compound in the emission layer.
 18. A diagnosticcomposition comprising at least one organometallic compound of claim 1.